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	diff --git a/FixedOrderGen/include/EventGenerator.hh b/FixedOrderGen/include/EventGenerator.hh
	index c696c72..e345a81 100644
	--- a/FixedOrderGen/include/EventGenerator.hh
	+++ b/FixedOrderGen/include/EventGenerator.hh
	@@ -1,65 +1,65 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#pragma once

	#include "HEJ/MatrixElement.hh"
	#include "HEJ/optional.hh"
	#include "HEJ/PDF.hh"
	#include "HEJ/RNG.hh"

	#include "Beam.hh"
	#include "Decay.hh"
	#include "JetParameters.hh"
	#include "Process.hh"
	#include "Status.hh"

	namespace HEJ{
	class Event;
	class HiggsCouplingSettings;
	class ScaleGenerator;
	class EWConstants;
	}

	//! Namespace for HEJ Fixed Order Generator
	namespace HEJFOG{
	class EventGenerator{
	public:
	EventGenerator(
	Process process,
	Beam beam,
	HEJ::ScaleGenerator scale_gen,
	JetParameters jets,
	int pdf_id,
	double subl_change,
	unsigned int subl_channels,
	- ParticlesDecayMap particles_decays,
	+ ParticlesDecayMap particle_decays,
	HEJ::HiggsCouplingSettings Higgs_coupling,
	HEJ::EWConstants ew_parameters,
	HEJ::RNG & ran
	);

	HEJ::optional<HEJ::Event> gen_event();

	Status status() const {
	return status_;
	}

	private:
	HEJ::PDF pdf_;
	HEJ::MatrixElement ME_;
	HEJ::ScaleGenerator scale_gen_;
	Process process_;
	JetParameters jets_;
	Beam beam_;
	Status status_;
	double subl_change_;
	unsigned int subl_channels_;
	- ParticlesDecayMap particles_decays_;
	+ ParticlesDecayMap particle_decays_;
	HEJ::EWConstants ew_parameters_;
	std::reference_wrapper<HEJ::RNG> ran_;
	};

	}
	diff --git a/FixedOrderGen/include/PhaseSpacePoint.hh b/FixedOrderGen/include/PhaseSpacePoint.hh
	index 0764045..16bcd9d 100644
	--- a/FixedOrderGen/include/PhaseSpacePoint.hh
	+++ b/FixedOrderGen/include/PhaseSpacePoint.hh
	@@ -1,230 +1,230 @@
	/** \file PhaseSpacePoint.hh
	* \brief Contains the PhaseSpacePoint Class
	*
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#pragma once

	#include <bitset>
	#include <vector>

	#include "HEJ/Event.hh"
	#include "HEJ/Particle.hh"
	#include "HEJ/PDF.hh"
	#include "HEJ/PDG_codes.hh"
	#include "HEJ/RNG.hh"

	#include "JetParameters.hh"
	#include "Decay.hh"
	#include "Status.hh"

	namespace HEJ{
	class EWConstants;
	}

	namespace HEJFOG{
	class Process;

	using HEJ::Particle;
	//! A point in resummation phase space
	class PhaseSpacePoint{
	public:
	//! Default PhaseSpacePoint Constructor
	PhaseSpacePoint() = delete;

	//! PhaseSpacePoint Constructor
	/**
	* @param proc The process to generate
	* @param jet_properties Jet defintion & cuts
	* @param pdf The pdf set (used for sampling)
	* @param E_beam Energie of the beam
	* @param subl_chance Chance to turn a potentially unordered
	* emission into an actual one
	* @param subl_channels Possible subleading channels.
	* see HEJFOG::Subleading
	* @param particle_properties Properties of producted boson
	*
	* Initially, only FKL phase space points are generated. subl_chance gives
	* the change of turning one emissions into a subleading configuration,
	* i.e. either unordered or central quark/anti-quark pair. Unordered
	* emissions require that the most extremal emission in any direction is
	* a quark or anti-quark and the next emission is a gluon. Quark/anti-quark
	* pairs are only generated for W processes. At most one subleading
	* emission will be generated in this way.
	*/
	PhaseSpacePoint(
	Process const & proc,
	JetParameters const & jet_properties,
	HEJ::PDF & pdf, double E_beam,
	double subl_chance,
	unsigned int subl_channels,
	- ParticlesDecayMap const & particles_decays,
	+ ParticlesDecayMap const & particle_decays,
	HEJ::EWConstants const & ew_parameters,
	HEJ::RNG & ran
	);

	//! Get Weight Function
	/**
	* @returns Weight of Event
	*/
	double weight() const{
	return weight_;
	}

	Status status() const{
	return status_;
	}

	//! Get Incoming Function
	/**
	* @returns Incoming Particles
	*/
	std::array<Particle, 2> const & incoming() const{
	return incoming_;
	}

	//! Get Outgoing Function
	/**
	* @returns Outgoing Particles
	*/
	std::vector<Particle> const & outgoing() const{
	return outgoing_;
	}

	std::unordered_map<size_t, std::vector<Particle>> const & decays() const{
	return decays_;
	}

	private:
	/**
	* @internal
	* @brief Generate LO parton momentum
	*
	* @param count Number of partons to generate
	* @param is_pure_jets If true ensures momentum conservation in x and y
	* @param jet_param Jet properties to fulfil
	* @param max_pt max allowed pt for a parton (typically E_CMS)
	* @param ran Random Number Generator
	*
	* @returns Momentum of partons
	*
	* Ensures that each parton is in its own jet.
	* Generation is independent of parton flavour. Output is sorted in rapidity.
	*/
	std::vector<fastjet::PseudoJet> gen_LO_partons(
	int count, bool is_pure_jets,
	JetParameters const & jet_param,
	double max_pt,
	HEJ::RNG & ran
	);
	Particle gen_boson(
	HEJ::ParticleID bosonid, double mass, double width,
	HEJ::RNG & ran
	);
	template<class ParticleMomenta>
	fastjet::PseudoJet gen_last_momentum(
	ParticleMomenta const & other_momenta,
	double mass_square, double y
	) const;

	bool jets_ok(
	std::vector<fastjet::PseudoJet> const & Born_jets,
	std::vector<fastjet::PseudoJet> const & partons
	) const;
	/**
	* @internal
	* @brief Generate incoming partons according to the PDF
	*
	* @param uf Scale used in the PDF
	*/
	void reconstruct_incoming(
	Process const & proc, unsigned int subl_channels,
	HEJ::PDF & pdf, double E_beam,
	double uf,
	HEJ::RNG & ran
	);
	/**
	* @internal
	* @brief Returns list of all allowed initial states partons
	*/
	std::array<std::bitset<11>,2> filter_partons(
	Process const & proc, unsigned int const subl_channels,
	HEJ::RNG & ran
	);
	HEJ::ParticleID generate_incoming_id(
	size_t beam_idx, double x, double uf, HEJ::PDF & pdf,
	std::bitset<11> allowed_partons, HEJ::RNG & ran
	);

	bool momentum_conserved(double ep) const;

	HEJ::Particle const & most_backward_FKL(
	std::vector<HEJ::Particle> const & partons
	) const;
	HEJ::Particle const & most_forward_FKL(
	std::vector<HEJ::Particle> const & partons
	) const;
	HEJ::Particle & most_backward_FKL(std::vector<HEJ::Particle> & partons) const;
	HEJ::Particle & most_forward_FKL(std::vector<HEJ::Particle> & partons) const;
	bool extremal_FKL_ok(
	std::vector<fastjet::PseudoJet> const & partons
	) const;
	double random_normal(double stddev, HEJ::RNG & ran);
	/**
	* @internal
	* @brief Turns a FKL configuration into a subleading one
	*
	* @param chance Change to switch to subleading configuration
	* @param channels Allowed channels for subleading process
	* @param proc Process to decide which subleading
	* configurations are allowed
	*
	* With a chance of "chance" the FKL configuration is either turned into
	* a unordered configuration or, for A/W/Z bosons, a configuration with
	* a central quark/anti-quark pair.
	*/
	void maybe_turn_to_subl(double chance, unsigned int channels,
	Process const & proc, HEJ::RNG & ran);
	void turn_to_uno(bool can_be_uno_backward, bool can_be_uno_forward, HEJ::RNG & ran);
	void turn_to_qqx(bool allow_strange, HEJ::RNG & ran);
	//! decay where we select the decay channel
	std::vector<Particle> decay_boson(
	HEJ::Particle const & parent,
	std::vector<Decay> const & decays,
	HEJ::RNG & ran
	);
	//! generate decay products of a boson
	std::vector<Particle> decay_boson(
	HEJ::Particle const & parent,
	std::vector<HEJ::ParticleID> const & decays,
	HEJ::RNG & ran
	);
	/// @brief setup outgoing partons to ensure correct coupling to boson
	void couple_boson(HEJ::ParticleID boson, HEJ::RNG & ran);
	Decay select_decay_channel(
	std::vector<Decay> const & decays,
	HEJ::RNG & ran
	);
	double gen_hard_pt(
	int np, double ptmin, double ptmax, double y,
	HEJ::RNG & ran
	);
	double gen_soft_pt(int np, double ptmax, HEJ::RNG & ran);
	double gen_parton_pt(
	int count, JetParameters const & jet_param, double ptmax, double y,
	HEJ::RNG & ran
	);

	double weight_;

	Status status_;

	std::array<Particle, 2> incoming_;
	std::vector<Particle> outgoing_;
	//! Particle decays in the format {outgoing index, decay products}
	std::unordered_map<size_t, std::vector<Particle>> decays_;
	};
	HEJ::Event::EventData to_EventData(PhaseSpacePoint const & psp);
	}
	diff --git a/FixedOrderGen/include/config.hh b/FixedOrderGen/include/config.hh
	index 06a2487..d302168 100644
	--- a/FixedOrderGen/include/config.hh
	+++ b/FixedOrderGen/include/config.hh
	@@ -1,45 +1,45 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#pragma once

	#include "yaml-cpp/yaml.h"

	#include "HEJ/HiggsCouplingSettings.hh"
	#include "HEJ/optional.hh"
	#include "HEJ/config.hh"
	#include "HEJ/output_formats.hh"
	#include "HEJ/exceptions.hh"
	#include "HEJ/EWConstants.hh"

	#include "Beam.hh"
	#include "Decay.hh"
	#include "JetParameters.hh"
	#include "Process.hh"
	#include "UnweightSettings.hh"

	namespace HEJFOG{

	struct Config{
	Process process;
	int events;
	JetParameters jets;
	Beam beam;
	int pdf_id;
	double subleading_fraction;
	unsigned int subleading_channels; //! < see HEJFOG::Subleading
	- ParticlesDecayMap particles_decays;
	+ ParticlesDecayMap particle_decays;
	YAML::Node analysis_parameters;
	HEJ::ScaleConfig scales;
	std::vector<HEJ::OutputFile> output;
	HEJ::RNGConfig rng;
	HEJ::HiggsCouplingSettings Higgs_coupling;
	HEJ::EWConstants ew_parameters;
	HEJ::optional<UnweightSettings> unweight;
	};

	Config load_config(std::string const & config_file);

	}
	diff --git a/FixedOrderGen/src/EventGenerator.cc b/FixedOrderGen/src/EventGenerator.cc
	index 3d2dfe6..8058577 100644
	--- a/FixedOrderGen/src/EventGenerator.cc
	+++ b/FixedOrderGen/src/EventGenerator.cc
	@@ -1,90 +1,90 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include "EventGenerator.hh"

	#include "Process.hh"
	#include "Beam.hh"
	#include "JetParameters.hh"
	#include "PhaseSpacePoint.hh"

	#include "HEJ/config.hh"
	#include "HEJ/Event.hh"
	#include "HEJ/EWConstants.hh"

	namespace HEJFOG{
	EventGenerator::EventGenerator(
	Process process,
	Beam beam,
	HEJ::ScaleGenerator scale_gen,
	JetParameters jets,
	int pdf_id,
	double subl_change,
	unsigned int subl_channels,
	- ParticlesDecayMap particles_decays,
	+ ParticlesDecayMap particle_decays,
	HEJ::HiggsCouplingSettings Higgs_coupling,
	HEJ::EWConstants ew_parameters,
	HEJ::RNG & ran
	):
	pdf_{pdf_id, beam.particles[0], beam.particles[1]},
	ME_{
	[this](double mu){ return pdf_.Halphas(mu); },
	HEJ::MatrixElementConfig{
	false,
	std::move(Higgs_coupling),
	ew_parameters
	}
	},
	scale_gen_{std::move(scale_gen)},
	process_{std::move(process)},
	jets_{std::move(jets)},
	beam_{std::move(beam)},
	subl_change_{subl_change},
	subl_channels_{subl_channels},
	- particles_decays_{std::move(particles_decays)},
	+ particle_decays_{std::move(particle_decays)},
	ew_parameters_{ew_parameters},
	ran_{ran}
	{
	}

	HEJ::optional<HEJ::Event> EventGenerator::gen_event(){
	HEJFOG::PhaseSpacePoint psp{
	process_,
	jets_,
	pdf_, beam_.energy,
	subl_change_, subl_channels_,
	- particles_decays_,
	+ particle_decays_,
	ew_parameters_,
	ran_
	};
	status_ = psp.status();
	if(status_ != good) return {};

	HEJ::Event ev = scale_gen_(
	HEJ::Event{
	to_EventData( std::move(psp) ).cluster( jets_.def, jets_.min_pt)
	}
	);

	ev.generate_colours(ran_);

	const double shat = HEJ::shat(ev);
	const double xa = (ev.incoming()[0].E()-ev.incoming()[0].pz())/(2.*beam_.energy);
	const double xb = (ev.incoming()[1].E()+ev.incoming()[1].pz())/(2.*beam_.energy);

	// evaluate matrix element
	ev.parameters() = ME_.tree(ev)/(shatshat);
	// and PDFs
	ev.central().weight *= pdf_.pdfpt(0,xa,ev.central().muf, ev.incoming()[0].type);
	ev.central().weight *= pdf_.pdfpt(0,xb,ev.central().muf, ev.incoming()[1].type);
	for(size_t i = 0; i < ev.variations().size(); ++i){
	auto & var = ev.variations(i);
	var.weight *= pdf_.pdfpt(0,xa,var.muf, ev.incoming()[0].type);
	var.weight *= pdf_.pdfpt(0,xb,var.muf, ev.incoming()[1].type);
	}
	return ev;
	}

	}
	diff --git a/FixedOrderGen/src/PhaseSpacePoint.cc b/FixedOrderGen/src/PhaseSpacePoint.cc
	index 63c7e2b..3ff9ddb 100644
	--- a/FixedOrderGen/src/PhaseSpacePoint.cc
	+++ b/FixedOrderGen/src/PhaseSpacePoint.cc
	@@ -1,693 +1,693 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include "PhaseSpacePoint.hh"

	#include <algorithm>

	#include "CLHEP/Vector/LorentzVector.h"

	#include "HEJ/Constants.hh"
	#include "HEJ/EWConstants.hh"
	#include "HEJ/exceptions.hh"
	#include "HEJ/kinematics.hh"
	#include "HEJ/Particle.hh"
	#include "HEJ/utility.hh"

	#include "Process.hh"
	#include "Subleading.hh"

	using namespace HEJ;

	namespace HEJFOG{

	static_assert(
	std::numeric_limits<double>::has_quiet_NaN,
	"no quiet NaN for double"
	);
	constexpr double NaN = std::numeric_limits<double>::quiet_NaN();

	HEJ::Event::EventData to_EventData(PhaseSpacePoint const & psp){
	HEJ::Event::EventData result;
	result.incoming = psp.incoming();
	assert(result.incoming.size() == 2);
	result.outgoing=psp.outgoing();
	// technically Event::EventData doesn't have to be sorted,
	// but PhaseSpacePoint should be anyway
	assert(
	std::is_sorted(
	begin(result.outgoing), end(result.outgoing),
	HEJ::rapidity_less{}
	)
	);
	assert(result.outgoing.size() >= 2);
	result.decays=psp.decays();
	result.parameters.central= {NaN, NaN, psp.weight() };
	return result;
	}

	namespace{
	bool can_swap_to_uno(
	HEJ::Particle const & p1, HEJ::Particle const & p2
	){
	return is_parton(p1)
	&& p1.type != pid::gluon
	&& p2.type == pid::gluon;
	}

	size_t count_gluons(std::vector<Particle>::const_iterator first,
	std::vector<Particle>::const_iterator last){
	return std::count_if(first, last, [](Particle const & p)
	{return p.type == pid::gluon;});
	}

	/** assumes FKL configurations between first and last,
	* else there can be a quark in a non-extreme position
	* e.g. uno configuration gqg would pass
	*/
	bool can_change_to_qqx(
	std::vector<Particle>::const_iterator first,
	std::vector<Particle>::const_iterator last){
	return 1 < count_gluons(first,last);
	}
	bool is_AWZ_proccess(Process const & proc){
	return proc.boson && is_AWZ_boson(*proc.boson);
	}

	bool is_up_type(Particle const & part){
	return HEJ::is_anyquark(part) && !(abs(part.type)%2);
	}
	bool is_down_type(Particle const & part){
	return HEJ::is_anyquark(part) && abs(part.type)%2;
	}
	bool can_couple_to_W(Particle const & part, pid::ParticleID const W_id){
	const int W_charge = W_id>0?1:-1;
	return abs(part.type)<5
	&& ( (W_charge*part.type > 0 && is_up_type(part))
	\|\| (W_charge*part.type < 0 && is_down_type(part)) );
	}
	}

	void PhaseSpacePoint::maybe_turn_to_subl(
	double chance,
	unsigned int const channels,
	Process const & proc,
	HEJ::RNG & ran
	){
	if(proc.njets <= 2) return;
	assert(outgoing_.size() >= 2);

	// decide what kind of subleading process is allowed
	bool allow_uno = false;
	bool allow_strange = true;
	const size_t nout = outgoing_.size();
	const bool can_be_uno_backward = (channels&Subleading::uno)
	&& can_swap_to_uno(outgoing_[0], outgoing_[1]);
	const bool can_be_uno_forward = (channels&Subleading::uno)
	&& can_swap_to_uno(outgoing_[nout-1], outgoing_[nout-2]);
	allow_uno = can_be_uno_backward \|\| can_be_uno_forward;

	bool allow_qqx = false;
	if(is_AWZ_proccess(proc)) {
	allow_qqx = (channels&Subleading::qqx)
	&& can_change_to_qqx(outgoing_.cbegin(), outgoing_.cend());
	if(std::none_of(outgoing_.cbegin(), outgoing_.cend(),
	[&proc](Particle const & p){ return can_couple_to_W(p, *proc.boson);})) {
	// enforce qqx if A/W/Z can't couple somewhere else
	assert(allow_qqx);
	allow_uno = false;
	chance = 1.;
	// strange not allowed for W
	if(abs(*proc.boson)== pid::Wp) allow_strange = false;
	}
	}

	if(!allow_uno && !allow_qqx) return;
	if(ran.flat() < chance){
	weight_ /= chance;
	if(allow_uno && !allow_qqx){
	turn_to_uno(can_be_uno_backward, can_be_uno_forward, ran);
	} else if (!allow_uno && allow_qqx) {
	turn_to_qqx(allow_strange, ran);
	} else {
	assert( allow_uno && allow_qqx);
	if(ran.flat() < 0.5) turn_to_uno(can_be_uno_backward, can_be_uno_forward, ran);
	else turn_to_qqx(allow_strange, ran);
	weight_ *= 2.;
	}
	} else weight_ /= 1 - chance;

	}

	void PhaseSpacePoint::turn_to_uno(
	const bool can_be_uno_backward, const bool can_be_uno_forward,
	HEJ::RNG & ran
	){
	if(!can_be_uno_backward && !can_be_uno_forward) return;
	const size_t nout = outgoing_.size();
	if(can_be_uno_backward && can_be_uno_forward){
	if(ran.flat() < 0.5){
	std::swap(outgoing_[0].type, outgoing_[1].type);
	} else {
	std::swap(outgoing_[nout-1].type, outgoing_[nout-2].type);
	}
	weight_ *= 2.;
	} else if(can_be_uno_backward){
	std::swap(outgoing_[0].type, outgoing_[1].type);
	} else {
	assert(can_be_uno_forward);
	std::swap(outgoing_[nout-1].type, outgoing_[nout-2].type);
	}
	}

	void PhaseSpacePoint::turn_to_qqx(const bool allow_strange, HEJ::RNG & ran){
	/// find first and last gluon in FKL chain
	auto first = std::find_if(outgoing_.begin(), outgoing_.end(),
	[](Particle const & p){return p.type == pid::gluon;});
	std::vector<Particle*> FKL_gluons;
	for(auto p = first; p!=outgoing_.end(); ++p){
	if(p->type == pid::gluon) FKL_gluons.push_back(&*p);
	else if(is_anyquark(*p)) break;
	}
	const size_t ng = FKL_gluons.size();
	if(ng < 2)
	throw std::logic_error("not enough gluons to create qqx");
	// select flavour of quark
	const double r1 = 2.*ran.flat()-1.;
	const double max_flavour = allow_strange?n_f:n_f-1;
	weight_ = max_flavour2;
	int flavour = pid::down + std::floor(std::abs(r1)*max_flavour);
	flavour*=r1<0.?-1:1;
	// select gluon for switch
	const size_t idx = floor((ng-1) * ran.flat());
	weight_ *= (ng-1);
	FKL_gluons[idx]->type = ParticleID(flavour);
	FKL_gluons[idx+1]->type = ParticleID(-flavour);
	}

	template<class ParticleMomenta>
	fastjet::PseudoJet PhaseSpacePoint::gen_last_momentum(
	ParticleMomenta const & other_momenta,
	const double mass_square, const double y
	) const {
	std::array<double,2> pt{0.,0.};
	for (auto const & p: other_momenta) {
	pt[0]-= p.px();
	pt[1]-= p.py();
	}

	const double mperp = sqrt(pt[0]pt[0]+pt[1]pt[1]+mass_square);
	const double pz=mperp*sinh(y);
	const double E=mperp*cosh(y);

	return {pt[0], pt[1], pz, E};
	}

	namespace {
	//! adds a particle to target (in correct rapidity ordering)
	//! @returns positon of insertion
	auto insert_particle(std::vector<HEJ::Particle> & target,
	HEJ::Particle && particle
	){
	const auto pos = std::upper_bound(
	begin(target),end(target),particle,rapidity_less{}
	);
	target.insert(pos, std::move(particle));
	return pos;
	}
	}

	PhaseSpacePoint::PhaseSpacePoint(
	Process const & proc,
	JetParameters const & jet_param,
	HEJ::PDF & pdf, double E_beam,
	double const subl_chance,
	unsigned int const subl_channels,
	- ParticlesDecayMap const & particles_decays,
	+ ParticlesDecayMap const & particle_decays,
	HEJ::EWConstants const & ew_parameters,
	HEJ::RNG & ran
	)
	{
	// auto proc{ proc_in }; // @TODO remove
	assert(proc.njets >= 2);
	status_ = good;
	weight_ = 1;

	const int nout = proc.njets + (proc.boson?1:0) + proc.boson_decay.size();
	outgoing_.reserve(nout);

	// generate parton momenta
	const bool is_pure_jets = (nout == proc.njets);
	auto partons = gen_LO_partons(
	proc.njets, is_pure_jets, jet_param, E_beam, ran
	);
	// pre fill flavour with gluons
	for(auto&& p_out: partons) {
	outgoing_.emplace_back(Particle{pid::gluon, std::move(p_out), {}});
	}
	if(status_ != good) return;

	if(proc.boson){ // decay boson
	const auto & boson_prop = ew_parameters.prop(*proc.boson) ;
	auto boson{ gen_boson(*proc.boson, boson_prop.mass, boson_prop.width, ran) };
	const auto pos{insert_particle(outgoing_, std::move(boson))};
	const size_t boson_idx = std::distance(begin(outgoing_), pos);
	- const auto & boson_decay = particles_decays.find(*proc.boson);
	+ const auto & boson_decay = particle_decays.find(*proc.boson);
	if( !proc.boson_decay.empty() ){ // decay given in proc
	decays_.emplace(
	boson_idx,
	decay_boson(outgoing_[boson_idx], proc.boson_decay, ran)
	);
	- } else if( boson_decay != particles_decays.end()
	+ } else if( boson_decay != particle_decays.end()
	&& !boson_decay->second.empty() ){ // decay given explicitly
	decays_.emplace(
	boson_idx,
	decay_boson(outgoing_[boson_idx], boson_decay->second, ran)
	);
	}
	}
	// normalisation of momentum-conserving delta function
	weight_ = pow(2M_PI, 4);

	/** @TODO
	* uf (jet_param.min_pt) doesn't correspond to our final scale choice.
	* The HEJ scale generators currently expect a full event as input,
	* so fixing this is not completely trivial
	*/
	reconstruct_incoming(proc, subl_channels, pdf, E_beam, jet_param.min_pt, ran);
	if(status_ != good) return;
	// set outgoing states
	most_backward_FKL(outgoing_).type = incoming_[0].type;
	most_forward_FKL(outgoing_).type = incoming_[1].type;

	maybe_turn_to_subl(subl_chance, subl_channels, proc, ran);

	if(proc.boson) couple_boson(*proc.boson, ran);
	}

	double PhaseSpacePoint::gen_hard_pt(
	int np , double ptmin, double ptmax, double y,
	HEJ::RNG & ran
	) {
	// heuristic parameters for pt sampling
	const double ptpar = ptmin + np/5.;
	const double arg_small_y = atan((ptmax - ptmin)/ptpar);
	const double y_cut = 3.;

	const double r1 = ran.flat();
	if(y < y_cut){
	const double pt = ptmin + ptpartan(r1arg_small_y);
	const double temp = cos(r1*arg_small_y);
	weight_ = ptptpararg_small_y/(temptemp);
	return pt;
	}

	const double ptpar2 = ptpar/(1 + 5*(y-y_cut));
	const double temp = 1. - std::exp((ptmin-ptmax)/ptpar2);
	const double pt = ptmin - ptpar2std::log(1-r1temp);
	weight_ = ptptpar2temp/(1-r1temp);
	return pt;
	}

	double PhaseSpacePoint::gen_soft_pt(int np, double max_pt, HEJ::RNG & ran) {
	constexpr double ptpar = 4.;

	const double r = ran.flat();
	const double pt = max_pt + ptpar/np*std::log(r);
	weight_ = ptptpar/(np*r);
	return pt;
	}

	double PhaseSpacePoint::gen_parton_pt(
	int count, JetParameters const & jet_param, double max_pt, double y,
	HEJ::RNG & ran
	) {
	constexpr double p_small_pt = 0.02;

	if(! jet_param.peak_pt) {
	return gen_hard_pt(count, jet_param.min_pt, max_pt, y, ran);
	}
	const double r = ran.flat();
	if(r > p_small_pt) {
	weight_ /= 1. - p_small_pt;
	return gen_hard_pt(count, *jet_param.peak_pt, max_pt, y, ran);
	}
	weight_ /= p_small_pt;
	const double pt = gen_soft_pt(count, *jet_param.peak_pt, ran);
	if(pt < jet_param.min_pt) {
	weight_=0.0;
	status_ = not_enough_jets;
	return jet_param.min_pt;
	}
	return pt;
	}

	std::vector<fastjet::PseudoJet> PhaseSpacePoint::gen_LO_partons(
	int np, bool is_pure_jets,
	JetParameters const & jet_param,
	double max_pt,
	HEJ::RNG & ran
	){
	if (np<2) throw std::invalid_argument{"Not enough partons in gen_LO_partons"};

	weight_ /= pow(16.*pow(M_PI,3),np);
	weight_ /= std::tgamma(np+1); //remove rapidity ordering
	std::vector<fastjet::PseudoJet> partons;
	partons.reserve(np);
	for(int i = 0; i < np; ++i){
	const double y = -jet_param.max_y + 2jet_param.max_yran.flat();
	weight_ = 2jet_param.max_y;

	const bool is_last_parton = i+1 == np;
	if(is_pure_jets && is_last_parton) {
	constexpr double parton_mass_sq = 0.;
	partons.emplace_back(gen_last_momentum(partons, parton_mass_sq, y));
	break;
	}

	const double phi = 2M_PIran.flat();
	weight_ = 2.0M_PI;

	const double pt = gen_parton_pt(np, jet_param, max_pt, y, ran);
	if(weight_ == 0.0) return {};

	partons.emplace_back(fastjet::PtYPhiM(pt, y, phi));
	assert(jet_param.min_pt <= partons[i].pt());
	assert(partons[i].pt() <= max_pt+1e-5);
	}
	// Need to check that at LO, the number of jets = number of partons;
	fastjet::ClusterSequence cs(partons, jet_param.def);
	auto cluster_jets=cs.inclusive_jets(jet_param.min_pt);
	if (cluster_jets.size()!=unsigned(np)){
	weight_=0.0;
	status_ = not_enough_jets;
	return {};
	}

	std::sort(begin(partons), end(partons), rapidity_less{});

	return partons;
	}

	Particle PhaseSpacePoint::gen_boson(
	HEJ::ParticleID bosonid, double mass, double width,
	HEJ::RNG & ran
	){
	// Usual phase space measure
	weight_ /= 16.*pow(M_PI, 3);

	// Generate a y Gaussian distributed around 0
	/// @TODO check magic numbers for different boson Higgs
	/// @TODO better sampling for W
	const double stddev_y = 1.6;
	const double y = random_normal(stddev_y, ran);
	const double r1 = ran.flat();
	const double s_boson = mass*(
	mass + widthtan(M_PI/2.r1 + (r1-1.)*atan(mass/width))
	);
	// off-shell s_boson sampling, compensates for Breit-Wigner
	/// @TODO use a flag instead
	if(abs(bosonid) == pid::Wp){
	weight_/=M_PIM_PI8.;
	weight_= masswidth( M_PI+2.atan(mass/width) )
	/ ( 1. + cos( M_PIr1 + 2.(r1-1.)*atan(mass/width) ) );
	}

	auto p = gen_last_momentum(outgoing_, s_boson, y);

	return Particle{bosonid, std::move(p), {}};
	}

	Particle const & PhaseSpacePoint::most_backward_FKL(
	std::vector<Particle> const & partons
	) const{
	if(!HEJ::is_parton(partons[0])) return partons[1];
	return partons[0];
	}

	Particle const & PhaseSpacePoint::most_forward_FKL(
	std::vector<Particle> const & partons
	) const{
	const size_t last_idx = partons.size() - 1;
	if(!HEJ::is_parton(partons[last_idx])) return partons[last_idx-1];
	return partons[last_idx];
	}

	Particle & PhaseSpacePoint::most_backward_FKL(
	std::vector<Particle> & partons
	) const{
	if(!HEJ::is_parton(partons[0])) return partons[1];
	return partons[0];
	}

	Particle & PhaseSpacePoint::most_forward_FKL(
	std::vector<Particle> & partons
	) const{
	const size_t last_idx = partons.size() - 1;
	if(!HEJ::is_parton(partons[last_idx])) return partons[last_idx-1];
	return partons[last_idx];
	}

	namespace {
	/// partons are ordered: even = anti, 0 = gluon
	ParticleID index_to_pid(size_t i){
	if(!i) return pid::gluon;
	return static_cast<ParticleID>(i%2?(i+1)/2:-i/2);
	}

	/// partons are ordered: even = anti, 0 = gluon
	size_t pid_to_index(ParticleID id){
	if(id==pid::gluon) return 0;
	return id>0?id2-1:abs(id)2;
	}

	std::bitset<11> init_allowed(ParticleID const id){
	if(abs(id) == pid::proton)
	return ~0;
	std::bitset<11> out = 0;
	if(is_parton(id))
	out[pid_to_index(id)] = 1;
	return out;
	}

	/// decides which "index" (see index_to_pid) are allowed for process
	std::bitset<11> allowed_quarks(ParticleID const boson){
	std::bitset<11> allowed = ~0;
	if(abs(boson) == pid::Wp){
	// special case W:
	// Wp: anti-down or up-type quark, no b/t -> 0001100110(1) = 205
	// Wm: down or anti-up-type quark, no b/t -> 0010011001(1) = 307
	allowed = boson>0?205:307;
	}
	return allowed;
	}
	}

	/**
	* checks which partons are allowed as initial state:
	* 1. only allow what is given in the Runcard (p -> all)
	* 2. A/W/Z require something to couple to
	* a) no qqx => no incoming gluon
	* b) 2j => no incoming gluon
	* c) 3j => can couple OR is gluon => 2 gluons become qqx later
	*/
	std::array<std::bitset<11>,2> PhaseSpacePoint::filter_partons(
	Process const & proc, unsigned int const subl_channels, HEJ::RNG & ran
	){
	std::array<std::bitset<11>,2> allowed_partons{
	init_allowed(proc.incoming[0]),
	init_allowed(proc.incoming[1])
	};
	bool const allow_qqx = subl_channels&Subleading::qqx;
	// special case A/W/Z
	if(is_AWZ_proccess(proc) && ((proc.njets < 4) \|\| !allow_qqx)){
	// all possible incoming states
	auto allowed(allowed_quarks(*proc.boson));
	if(proc.njets == 2 \|\| !allow_qqx) allowed[0]=0;

	// possible states per leg
	std::array<std::bitset<11>,2> const maybe_partons{
	allowed_partons[0]&allowed, allowed_partons[1]&allowed};

	if(maybe_partons[0].any() && maybe_partons[1].any()){
	// two options to get allowed initial state => choose one at random
	const size_t idx = ran.flat() < 0.5;
	allowed_partons[idx] = maybe_partons[idx];
	// else choose the possible
	} else if(maybe_partons[0].any()) {
	allowed_partons[0] = maybe_partons[0];
	} else if(maybe_partons[1].any()) {
	allowed_partons[1] = maybe_partons[1];
	} else{
	throw std::invalid_argument{"Incoming state not allowed."};
	}
	}
	return allowed_partons;
	}

	void PhaseSpacePoint::reconstruct_incoming(
	Process const & proc, unsigned int const subl_channels,
	HEJ::PDF & pdf, double E_beam,
	double uf,
	HEJ::RNG & ran
	){
	std::tie(incoming_[0].p, incoming_[1].p) = incoming_momenta(outgoing_);
	// calculate xa, xb
	const double sqrts=2*E_beam;
	const double xa=(incoming_[0].p.e()-incoming_[0].p.pz())/sqrts;
	const double xb=(incoming_[1].p.e()+incoming_[1].p.pz())/sqrts;
	// abort if phase space point is outside of collider energy reach
	if (xa>1. \|\| xb>1.){
	weight_=0;
	status_ = too_much_energy;
	return;
	}
	auto const & ids = proc.incoming;
	std::array<std::bitset<11>,2> allowed_partons(
	filter_partons(proc, subl_channels, ran));
	for(size_t i = 0; i < 2; ++i){
	if(ids[i] == pid::proton \|\| ids[i] == pid::p_bar){
	// pick ids according to pdfs
	incoming_[i].type =
	generate_incoming_id(i, i?xb:xa, uf, pdf, allowed_partons[i], ran);
	} else {
	assert(allowed_partons[i][pid_to_index(ids[i])]);
	incoming_[i].type = ids[i];
	}
	}
	assert(momentum_conserved(1e-7));
	}

	HEJ::ParticleID PhaseSpacePoint::generate_incoming_id(
	size_t const beam_idx, double const x, double const uf,
	HEJ::PDF & pdf, std::bitset<11> allowed_partons, HEJ::RNG & ran
	){
	std::array<double,11> pdf_wt;
	pdf_wt[0] = allowed_partons[0]?fabs(pdf.pdfpt(beam_idx,x,uf,pid::gluon)):0.;
	double pdftot = pdf_wt[0];
	for(size_t i = 1; i < pdf_wt.size(); ++i){
	pdf_wt[i] = allowed_partons[i]?4./9.*fabs(pdf.pdfpt(beam_idx,x,uf,index_to_pid(i))):0;
	pdftot += pdf_wt[i];
	}
	const double r1 = pdftot * ran.flat();
	double sum = 0;
	for(size_t i=0; i < pdf_wt.size(); ++i){
	if (r1 < (sum+=pdf_wt[i])){
	weight_*= pdftot/pdf_wt[i];
	return index_to_pid(i);
	}
	}
	std::cerr << "Error in choosing incoming parton: "<<x<<" "<<uf<<" "
	<<sum<<" "<<pdftot<<" "<<r1<<std::endl;
	throw std::logic_error{"Failed to choose parton flavour"};
	}

	void PhaseSpacePoint::couple_boson(
	HEJ::ParticleID const boson, HEJ::RNG & ran
	){
	if(abs(boson) != pid::Wp) return; // only matters for W
	/// @TODO this could be use to sanity check gamma and Z

	// find all possible quarks
	std::vector<Particle*> allowed_parts;
	for(auto & part: outgoing_){
	// Wp -> up OR anti-down, Wm -> anti-up OR down, no bottom
	if ( can_couple_to_W(part, boson) )
	allowed_parts.push_back(&part);
	}
	if(allowed_parts.size() == 0){
	throw std::logic_error{"Found no parton for coupling with boson"};
	}

	// select one and flip it
	size_t idx = 0;
	if(allowed_parts.size() > 1){
	/// @TODO more efficient sampling
	/// old code: probability[i] = exp(parton[i].y - W.y)
	idx = floor(ran.flat()*allowed_parts.size());
	weight_ *= allowed_parts.size();
	}
	const int W_charge = boson>0?1:-1;
	allowed_parts[idx]->type =
	static_cast<ParticleID>( allowed_parts[idx]->type - W_charge );
	}

	double PhaseSpacePoint::random_normal(
	double stddev,
	HEJ::RNG & ran
	){
	const double r1 = ran.flat();
	const double r2 = ran.flat();
	const double lninvr1 = -log(r1);
	const double result = stddevsqrt(2.lninvr1)cos(2.M_PI*r2);
	weight_ = exp(resultresult/(2stddevstddev))sqrt(2.M_PI)*stddev;
	return result;
	}

	bool PhaseSpacePoint::momentum_conserved(double ep) const{
	fastjet::PseudoJet diff;
	for(auto const & in: incoming()) diff += in.p;
	for(auto const & out: outgoing()) diff -= out.p;
	return nearby_ep(diff, fastjet::PseudoJet{}, ep);
	}

	Decay PhaseSpacePoint::select_decay_channel(
	std::vector<Decay> const & decays,
	HEJ::RNG & ran
	){
	double br_total = 0.;
	for(auto const & decay: decays) br_total += decay.branching_ratio;
	// adjust weight
	// this is given by (channel branching ratio)/(chance to pick channel)
	// where (chance to pick channel) =
	// (channel branching ratio)/(total branching ratio)
	weight_ *= br_total;
	if(decays.size()==1) return decays.front();
	const double r1 = br_total*ran.flat();
	double br_sum = 0.;
	for(auto const & decay: decays){
	br_sum += decay.branching_ratio;
	if(r1 < br_sum) return decay;
	}
	throw std::logic_error{"unreachable"};
	}

	std::vector<Particle> PhaseSpacePoint::decay_boson(
	HEJ::Particle const & parent,
	std::vector<Decay> const & decays,
	HEJ::RNG & ran
	){
	const auto channel = select_decay_channel(decays, ran);
	return decay_boson(parent, channel.products, ran);
	}

	std::vector<Particle> PhaseSpacePoint::decay_boson(
	HEJ::Particle const & parent,
	std::vector<HEJ::ParticleID> const & decays,
	HEJ::RNG & ran
	){
	if(decays.size() != 2){
	throw HEJ::not_implemented{
	"only decays into two particles are implemented"
	};
	}
	std::vector<Particle> decay_products(decays.size());
	for(size_t i = 0; i < decays.size(); ++i){
	decay_products[i].type = decays[i];
	}
	// choose polar and azimuth angle in parent rest frame
	const double E = parent.m()/2;
	const double theta = 2.M_PIran.flat();
	const double cos_phi = 2.*ran.flat()-1.;
	const double sin_phi = sqrt(1. - cos_phi*cos_phi); // Know 0 < phi < pi
	const double px = Ecos(theta)sin_phi;
	const double py = Esin(theta)sin_phi;
	const double pz = E*cos_phi;
	decay_products[0].p.reset(px, py, pz, E);
	decay_products[1].p.reset(-px, -py, -pz, E);
	for(auto & particle: decay_products) particle.p.boost(parent.p);
	return decay_products;
	}
	}
	diff --git a/FixedOrderGen/src/config.cc b/FixedOrderGen/src/config.cc
	index aa91355..447f6ab 100644
	--- a/FixedOrderGen/src/config.cc
	+++ b/FixedOrderGen/src/config.cc
	@@ -1,413 +1,413 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include "config.hh"

	#include <cctype>

	#include "Subleading.hh"

	#include "HEJ/config.hh"
	#include "HEJ/YAMLreader.hh"

	namespace HEJFOG{
	using HEJ::set_from_yaml;
	using HEJ::set_from_yaml_if_defined;
	using HEJ::pid::ParticleID;

	namespace{
	//! Get YAML tree of supported options
	/**
	* The configuration file is checked against this tree of options
	* in assert_all_options_known.
	*/
	YAML::Node const & get_supported_options(){
	const static YAML::Node supported = [](){
	YAML::Node supported;
	static const auto opts = {
	"process", "events", "subleading fraction","subleading channels",
	"scales", "scale factors", "max scale ratio", "pdf", "vev",
	"event output", "analysis", "import scales"
	};
	// add subnodes to "supported" - the assigned value is irrelevant
	for(auto && opt: opts) supported[opt] = "";
	for(auto && jet_opt: {"min pt", "peak pt", "algorithm", "R", "max rapidity"}){
	supported["jets"][jet_opt] = "";
	}
	for(auto && particle_type: {"Higgs", "W", "Z"}){
	for(auto && particle_opt: {"mass", "width"}){
	supported["particle properties"][particle_type][particle_opt] = "";
	}
	}
	for(auto && particle_type: {"Higgs", "Wp", "W+", "Wm", "W-", "Z"}){
	for(auto && particle_opt: {"into", "branching ratio"}){
	supported["decays"][particle_type][particle_opt] = "";
	}
	}
	for(auto && opt: {"mt", "use impact factors", "include bottom", "mb"}){
	supported["Higgs coupling"][opt] = "";
	}
	for(auto && beam_opt: {"energy", "particles"}){
	supported["beam"][beam_opt] = "";
	}
	for(auto && unweight_opt: {"sample size", "max deviation"}){
	supported["unweight"][unweight_opt] = "";
	}
	for(auto && opt: {"name", "seed"}){
	supported["random generator"][opt] = "";
	}
	return supported;
	}();
	return supported;
	}

	JetParameters get_jet_parameters(
	YAML::Node const & node, std::string const & entry
	){
	const auto p = HEJ::get_jet_parameters(node, entry);
	JetParameters result;
	result.def = p.def;
	result.min_pt = p.min_pt;
	set_from_yaml(result.max_y, node, entry, "max rapidity");
	set_from_yaml_if_defined(result.peak_pt, node, entry, "peak pt");
	if(result.peak_pt && *result.peak_pt <= result.min_pt)
	throw std::invalid_argument{
	"Value of option 'peak pt' has to be larger than 'min pt'."
	};
	return result;
	}

	Beam get_Beam(
	YAML::Node const & node, std::string const & entry
	){
	Beam beam;
	std::vector<HEJ::ParticleID> particles;
	set_from_yaml(beam.energy, node, entry, "energy");
	set_from_yaml_if_defined(particles, node, entry, "particles");
	if(! particles.empty()){
	for(HEJ::ParticleID particle: particles){
	if(particle != HEJ::pid::p && particle != HEJ::pid::p_bar){
	throw std::invalid_argument{
	"Unsupported value in option " + entry + ": particles:"
	" only proton ('p') and antiproton ('p_bar') beams are supported"
	};
	}
	}
	if(particles.size() != 2){
	throw std::invalid_argument{"Not exactly two beam particles"};
	}
	beam.particles.front() = particles.front();
	beam.particles.back() = particles.back();
	}
	return beam;
	}

	std::vector<std::string> split(
	std::string const & str, std::string const & delims
	){
	std::vector<std::string> result;
	for(size_t begin, end = 0; end != str.npos;){
	begin = str.find_first_not_of(delims, end);
	if(begin == str.npos) break;
	end = str.find_first_of(delims, begin + 1);
	result.emplace_back(str.substr(begin, end - begin));
	}
	return result;
	}

	std::invalid_argument invalid_incoming(std::string const & what){
	return std::invalid_argument{
	"Incoming particle type " + what + " not supported,"
	" incoming particles have to be 'p', 'p_bar' or partons"
	};
	}

	std::invalid_argument invalid_outgoing(std::string const & what){
	return std::invalid_argument{
	"Outgoing particle type " + what + " not supported,"
	" outgoing particles have to be 'j', 'photon', 'H', 'Wm', 'Wp', 'e-', 'e+', 'nu_e', 'nu_e_bar'"
	};
	}

	HEJ::ParticleID reconstruct_boson_id(
	std::vector<HEJ::ParticleID> const & ids
	){
	assert(ids.size()==2);
	const int pidsum = ids[0] + ids[1];
	if(pidsum == +1) {
	assert(HEJ::is_antilepton(ids[0]));
	if(HEJ::is_antineutrino(ids[0])) {
	throw HEJ::not_implemented{"lepton-flavour violating final state"};
	}
	assert(HEJ::is_neutrino(ids[1]));
	// charged antilepton + neutrino means we had a W+
	return HEJ::pid::Wp;
	}
	if(pidsum == -1) {
	assert(HEJ::is_antilepton(ids[0]));
	if(HEJ::is_neutrino(ids[1])) {
	throw HEJ::not_implemented{"lepton-flavour violating final state"};
	}
	assert(HEJ::is_antineutrino(ids[0]));
	// charged lepton + antineutrino means we had a W-
	return HEJ::pid::Wm;
	}
	throw HEJ::not_implemented{
	"final state with leptons "+HEJ::name(ids[0])+" and "+HEJ::name(ids[1])
	+" not supported"
	};
	}

	Process get_process(
	YAML::Node const & node, std::string const & entry
	){
	Process result;

	std::string process_string;
	set_from_yaml(process_string, node, entry);
	assert(! process_string.empty());
	const auto particles = split(process_string, " \n\t\v=>");
	if(particles.size() < 3){
	throw std::invalid_argument{
	"Bad format in option process: '" + process_string
	+ "', expected format is 'in1 in2 => out1 ...'"
	};
	}
	result.incoming.front() = HEJ::to_ParticleID(particles[0]);
	result.incoming.back() = HEJ::to_ParticleID(particles[1]);

	for(size_t i = 0; i < result.incoming.size(); ++i){
	const HEJ::ParticleID in = result.incoming[i];
	if(
	in != HEJ::pid::proton && in != HEJ::pid::p_bar
	&& !HEJ::is_parton(in)
	){
	throw invalid_incoming(particles[i]);
	}
	}
	result.njets = 0;
	for(size_t i = result.incoming.size(); i < particles.size(); ++i){
	assert(! particles[i].empty());
	if(particles[i] == "j") ++result.njets;
	else if(std::isdigit(particles[i].front())
	&& particles[i].back() == 'j')
	result.njets += std::stoi(particles[i]);
	else{
	const auto pid = HEJ::to_ParticleID(particles[i]);
	if(pid==HEJ::pid::Higgs \|\| pid==HEJ::pid::Wp \|\| pid==HEJ::pid::Wm){
	if(result.boson)
	throw std::invalid_argument{
	"More than one outgoing boson is not supported"
	};
	if(!result.boson_decay.empty())
	throw std::invalid_argument{
	"Production of a boson together with a lepton is not supported"
	};
	result.boson = pid;
	} else if (HEJ::is_anylepton(pid)){
	// Do not accept more leptons, if two leptons are already mentioned
	if( result.boson_decay.size()>=2 )
	throw std::invalid_argument{"Too many leptons provided"};
	if(result.boson)
	throw std::invalid_argument{
	"Production of a lepton together with a boson is not supported"
	};
	result.boson_decay.emplace_back(pid);
	} else {
	throw invalid_outgoing(particles[i]);
	}
	}
	}
	if(result.njets < 2){
	throw std::invalid_argument{
	"Process has to include at least two jets ('j')"
	};
	}
	if(!result.boson_decay.empty()){
	std::sort(begin(result.boson_decay),end(result.boson_decay));
	assert(!result.boson);
	result.boson = reconstruct_boson_id(result.boson_decay);
	}
	return result;
	}

	HEJFOG::Subleading to_subleading_channel(YAML::Node const & yaml){
	std::string name;
	using namespace HEJFOG::channels;
	set_from_yaml(name, yaml);
	if(name == "none")
	return none;
	if(name == "all")
	return all;
	if(name == "unordered" \|\| name == "uno")
	return uno;
	if(name == "qqx")
	return qqx;
	throw HEJ::unknown_option("Unknown subleading channel '"+name+"'");
	}

	unsigned int get_subleading_channels(YAML::Node const & node){
	using YAML::NodeType;
	using namespace HEJFOG::channels;
	// all channels allowed by default
	if(!node) return all;
	switch(node.Type()){
	case NodeType::Undefined:
	return all;
	case NodeType::Null:
	return none;
	case NodeType::Scalar:
	return to_subleading_channel(node);
	case NodeType::Map:
	throw HEJ::invalid_type{"map is not a valid option for subleading channels"};
	case NodeType::Sequence:
	unsigned int channels = HEJFOG::Subleading::none;
	for(auto && channel_node: node){
	channels \|= get_subleading_channels(channel_node);
	}
	return channels;
	}
	throw std::logic_error{"unreachable"};
	}

	Decay get_decay(YAML::Node const & node){
	Decay decay;
	set_from_yaml(decay.products, node, "into");
	decay.branching_ratio=1;
	set_from_yaml_if_defined(decay.branching_ratio, node, "branching ratio");
	return decay;
	}

	std::vector<Decay> get_decays(YAML::Node const & node){
	using YAML::NodeType;
	if(!node) return {};
	switch(node.Type()){
	case NodeType::Null:
	case NodeType::Undefined:
	return {};
	case NodeType::Scalar:
	throw HEJ::invalid_type{"value is not a list of decays"};
	case NodeType::Map:
	return {get_decay(node)};
	case NodeType::Sequence:
	std::vector<Decay> result;
	for(auto && decay_str: node){
	result.emplace_back(get_decay(decay_str));
	}
	return result;
	}
	throw std::logic_error{"unreachable"};
	}

	ParticlesDecayMap get_all_decays(YAML::Node const & node,
	std::string const & entry
	){
	if(!node[entry]) return {};
	if(!node[entry].IsMap())
	throw HEJ::invalid_type{entry + " have to be a map"};
	ParticlesDecayMap result;
	for(auto const & sub_node: node[entry]) {
	const auto name = sub_node.first.as<std::string>();
	const auto id = HEJ::to_ParticleID(name);
	result.emplace(id, get_decays(sub_node.second));
	}
	return result;
	}

	HEJ::ParticleProperties get_particle_properties(
	YAML::Node const & node, std::string const & entry,
	std::string const & boson
	){
	HEJ::ParticleProperties result;
	set_from_yaml(result.mass, node, entry, boson, "mass");
	set_from_yaml(result.width, node, entry, boson, "width");
	return result;
	}

	HEJ::EWConstants get_ew_parameters(YAML::Node const & node){
	HEJ::EWConstants result;
	double vev;
	set_from_yaml(vev, node, "vev");
	result.set_vevWZH(vev,
	get_particle_properties(node, "particle properties", "W"),
	get_particle_properties(node, "particle properties", "Z"),
	get_particle_properties(node, "particle properties", "Higgs")
	);
	return result;
	}

	UnweightSettings get_unweight(
	YAML::Node const & node, std::string const & entry
	){
	UnweightSettings result;
	set_from_yaml(result.sample_size, node, entry, "sample size");
	if(result.sample_size <= 0){
	throw std::invalid_argument{
	"negative sample size " + std::to_string(result.sample_size)
	};
	}
	set_from_yaml(result.max_dev, node, entry, "max deviation");
	return result;
	}

	Config to_Config(YAML::Node const & yaml){
	try{
	HEJ::assert_all_options_known(yaml, get_supported_options());
	}
	catch(HEJ::unknown_option const & ex){
	throw HEJ::unknown_option{std::string{"Unknown option '"} + ex.what() + "'"};
	}

	Config config;
	config.process = get_process(yaml, "process");
	set_from_yaml(config.events, yaml, "events");
	config.jets = get_jet_parameters(yaml, "jets");
	config.beam = get_Beam(yaml, "beam");
	for(size_t i = 0; i < config.process.incoming.size(); ++i){
	const auto & in = config.process.incoming[i];
	using namespace HEJ::pid;
	if( (in == p \|\| in == p_bar) && in != config.beam.particles[i]){
	throw std::invalid_argument{
	"Particle type of beam " + std::to_string(i+1) + " incompatible"
	+ " with type of incoming particle " + std::to_string(i+1)
	};
	}
	}
	set_from_yaml(config.pdf_id, yaml, "pdf");

	set_from_yaml(config.subleading_fraction, yaml, "subleading fraction");
	if(config.subleading_fraction < 0 \|\| config.subleading_fraction > 1){
	throw std::invalid_argument{
	"subleading fraction has to be between 0 and 1"
	};
	}
	if(config.subleading_fraction == 0)
	config.subleading_channels = Subleading::none;
	else
	config.subleading_channels = get_subleading_channels(yaml["subleading channels"]);

	config.ew_parameters = get_ew_parameters(yaml);
	- config.particles_decays = get_all_decays(yaml, "decays");
	+ config.particle_decays = get_all_decays(yaml, "decays");
	set_from_yaml_if_defined(config.analysis_parameters, yaml, "analysis");
	config.scales = HEJ::to_ScaleConfig(yaml);
	set_from_yaml_if_defined(config.output, yaml, "event output");
	config.rng = HEJ::to_RNGConfig(yaml, "random generator");
	config.Higgs_coupling = HEJ::get_Higgs_coupling(yaml, "Higgs coupling");
	if(yaml["unweight"]) config.unweight = get_unweight(yaml, "unweight");
	return config;
	}

	} // namespace anonymous

	Config load_config(std::string const & config_file){
	try{
	return to_Config(YAML::LoadFile(config_file));
	}
	catch(...){
	std::cerr << "Error reading " << config_file << ":\n ";
	throw;
	}
	}
	}
	diff --git a/FixedOrderGen/src/main.cc b/FixedOrderGen/src/main.cc
	index f1fdbe9..d0b83a3 100644
	--- a/FixedOrderGen/src/main.cc
	+++ b/FixedOrderGen/src/main.cc
	@@ -1,234 +1,234 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include <algorithm>
	#include <chrono>
	#include <fstream>
	#include <iostream>
	#include <map>
	#include <memory>

	#include "yaml-cpp/yaml.h"

	#include "LHEF/LHEF.h"

	#include "HEJ/CombinedEventWriter.hh"
	#include "HEJ/CrossSectionAccumulator.hh"
	#include "HEJ/get_analysis.hh"
	#include "HEJ/LesHouchesWriter.hh"
	#include "HEJ/make_RNG.hh"
	#include "HEJ/ProgressBar.hh"
	#include "HEJ/stream.hh"

	#include "config.hh"
	#include "EventGenerator.hh"
	#include "PhaseSpacePoint.hh"
	#include "Unweighter.hh"
	#include "Version.hh"

	namespace{
	constexpr auto banner =
	" __ ___ __ ______ __ "
	" __ \n / / / (_)___ _/ /_ / ____/___ "
	" ___ _________ ___ __ / /__ / /______ \n "
	" / /_/ / / __ `/ __ \\ / __/ / __ \\/ _ \\/ ___/ __ `/ / / / __ / / _"
	" \\/ __/ ___/ \n / __ / / /_/ / / / / / /___/ /"
	" / / __/ / / /_/ / /_/ / / /_/ / __/ /_(__ ) "
	" \n /_/ /_/_/\\__, /_/ /_/ /_____/_/ /_/\\___/_/ \\__, /\\__, / \\___"
	"_/\\___/\\__/____/ \n ____///__/ "
	"__ ____ ///__//____/ ______ __ "
	" \n / ____(_) _____ ____/ / / __ \\_________/ /__ _____ / "
	"____/__ ____ ___ _________ _/ /_____ _____\n / /_ / / \|/_/ _ \\/ __"
	" / / / / / ___/ __ / _ \\/ ___/ / / __/ _ \\/ __ \\/ _ \\/ ___/ __ `/ "
	"__/ __ \\/ ___/\n / __/ / /> </ __/ /_/ / / /_/ / / / /_/ / __/ / "
	" / /_/ / __/ / / / __/ / / /_/ / /_/ /_/ / / \n /_/ /_/_/\|_\|\\___"
	"/\\__,_/ \\____/_/ \\__,_/\\___/_/ \\____/\\___/_/ /_/\\___/_/ "
	"\\__,_/\\__/\\____/_/ \n";

	constexpr double invGeV2_to_pb = 389379292.;
	constexpr long long max_warmup_events = 10000;
	}

	HEJFOG::Config load_config(char const * filename){
	try{
	return HEJFOG::load_config(filename);
	}
	catch(std::exception const & exc){
	std::cerr << "Error: " << exc.what() << '\n';
	std::exit(EXIT_FAILURE);
	}
	}

	std::unique_ptr<HEJ::Analysis> get_analysis(
	YAML::Node const & parameters
	){
	try{
	return HEJ::get_analysis(parameters);
	}
	catch(std::exception const & exc){
	std::cerr << "Failed to load analysis: " << exc.what() << '\n';
	std::exit(EXIT_FAILURE);
	}
	}

	int main(int argn, char** argv) {
	using namespace std::string_literals;
	if (argn < 2) {
	std::cerr << "\n# Usage:\n." << argv[0] << " config_file\n";
	return EXIT_FAILURE;
	}
	std::cout << banner;
	std::cout << "Version " << HEJFOG::Version::String()
	<< ", revision " << HEJFOG::Version::revision() << std::endl;
	fastjet::ClusterSequence::print_banner();
	using clock = std::chrono::system_clock;

	const auto start_time = clock::now();

	// read configuration
	auto config = load_config(argv[1]);

	std::unique_ptr<HEJ::Analysis> analysis = get_analysis(
	config.analysis_parameters
	);
	assert(analysis != nullptr);

	auto ran = HEJ::make_RNG(config.rng.name, config.rng.seed);
	assert(ran != nullptr);

	HEJ::ScaleGenerator scale_gen{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	};

	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	std::move(scale_gen),
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	*ran
	};

	LHEF::HEPRUP heprup;
	heprup.IDBMUP=std::pair<long,long>(config.beam.particles[0], config.beam.particles[1]);
	heprup.EBMUP=std::make_pair(config.beam.energy, config.beam.energy);
	heprup.PDFGUP=std::make_pair(0,0);
	heprup.PDFSUP=std::make_pair(config.pdf_id,config.pdf_id);
	heprup.NPRUP=1;
	heprup.XSECUP=std::vector<double>(1.);
	heprup.XERRUP=std::vector<double>(1.);
	heprup.LPRUP=std::vector<int>{1};
	heprup.generators.emplace_back(LHEF::XMLTag{});
	heprup.generators.back().name = HEJFOG::Version::package_name();
	heprup.generators.back().version = HEJFOG::Version::String();

	HEJ::CombinedEventWriter writer{config.output, heprup};

	HEJ::optional<HEJFOG::Unweighter> unweighter{};
	std::map<HEJFOG::Status, int> status_counter;

	std::vector<HEJ::Event> events;
	int trials = 0;
	// warm-up phase to train unweighter
	if(config.unweight) {
	std::cout << "Calibrating unweighting ...\n";
	const auto warmup_start = clock::now();
	const size_t warmup_events = config.unweight->sample_size;
	HEJ::ProgressBar<size_t> warmup_progress{std::cout, warmup_events};
	for(; events.size() < warmup_events; ++trials){
	auto ev = generator.gen_event();
	++status_counter[generator.status()];
	assert( (generator.status() == HEJFOG::good) == bool(ev) );
	if(generator.status() == HEJFOG::good && analysis->pass_cuts(ev, ev)) {
	events.emplace_back(std::move(*ev));
	++warmup_progress;
	}
	}
	std::cout << std::endl;
	unweighter = HEJFOG::Unweighter{
	begin(events), end(events), config.unweight->max_dev, *ran,
	config.jets.peak_pt?(*config.jets.peak_pt):0.
	};
	std::vector<HEJ::Event> unweighted_events;
	for(auto && ev: events) {
	auto unweighted = unweighter->unweight(std::move(ev));
	if(unweighted) {
	unweighted_events.emplace_back(std::move(*unweighted));
	}
	}
	events = std::move(unweighted_events);
	if(events.empty()) {
	std::cerr <<
	"Failed to generate events. Please increase \"unweight: sample size\""
	" or reduce \"unweight: max deviation\"\n";
	return EXIT_FAILURE;
	}
	const auto warmup_end = clock::now();
	const double completion = static_cast<double>(events.size())/config.events;
	const std::chrono::duration<double> remaining_time =
	(warmup_end- warmup_start)*(1./completion - 1);
	const auto finish = clock::to_time_t(
	std::chrono::time_point_cast<std::chrono::seconds>(warmup_end + remaining_time)
	);
	std::cout
	<< "Generated " << events.size() << "/" << config.events << " events ("
	<< static_cast<int>(std::round(100*completion)) << "%)\n"
	<< "Estimated remaining generation time: "
	<< remaining_time.count() << " seconds ("
	<< std::put_time(std::localtime(&finish), "%c") << ")\n\n";
	}

	HEJ::ProgressBar<long long> progress{std::cout, config.events};
	progress.increment(events.size());
	events.reserve(config.events);
	for(; events.size() < static_cast<size_t>(config.events); ++trials){
	auto ev = generator.gen_event();
	++status_counter[generator.status()];
	assert( (generator.status() == HEJFOG::good) == bool(ev) );
	if(generator.status() == HEJFOG::good && analysis->pass_cuts(ev, ev)) {
	if(unweighter) {
	auto unweighted = unweighter->unweight(std::move(*ev));
	if(! unweighted) continue;
	ev = std::move(unweighted);
	}
	events.emplace_back(std::move(*ev));
	++progress;
	}
	}
	std::cout << std::endl;

	HEJ::CrossSectionAccumulator xs;
	for(auto & ev: events){
	ev.parameters() *= invGeV2_to_pb/trials;
	analysis->fill(ev, ev);
	writer.write(ev);
	xs.fill(ev);
	}
	analysis->finalise();

	const std::chrono::duration<double> run_time = (clock::now() - start_time);
	std::cout << "\nTask Runtime: " << run_time.count() << " seconds.\n\n";

	std::cout << xs << '\n';

	for(auto && entry: status_counter){
	const double fraction = static_cast<double>(entry.second)/trials;
	const int percent = std::round(100*fraction);
	std::cout << "status "
	<< std::left << std::setw(16) << (to_string(entry.first) + ":")
	<< " [";
	for(int i = 0; i < percent/2; ++i) std::cout << '#';
	for(int i = percent/2; i < 50; ++i) std::cout << ' ';
	std::cout << "] " << percent << "%\n";
	}
	return EXIT_SUCCESS;
	}
	diff --git a/FixedOrderGen/t/2j.cc b/FixedOrderGen/t/2j.cc
	index 99419ba..7d0ebd6 100644
	--- a/FixedOrderGen/t/2j.cc
	+++ b/FixedOrderGen/t/2j.cc
	@@ -1,67 +1,67 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#ifdef NDEBUG
	#undef NDEBUG
	#endif

	#include <algorithm>
	#include <cmath>
	#include <cassert>
	#include <iostream>

	#include "config.hh"
	#include "EventGenerator.hh"
	#include "HEJ/Mixmax.hh"

	#include "HEJ/Event.hh"
	#include "HEJ/PDF.hh"
	#include "HEJ/MatrixElement.hh"

	using namespace HEJFOG;

	int main(){
	constexpr double invGeV2_to_pb = 389379292.;
	constexpr double xs_ref = 86.42031848*1e6; //calculated with "combined" HEJ svn r3480

	auto config = load_config("config_2j.yml");

	HEJ::Mixmax ran{};
	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	HEJ::ScaleGenerator{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	},
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	ran
	};

	double xs = 0., xs_err = 0.;
	for (int trials = 0; trials < config.events; ++trials){
	auto ev = generator.gen_event();
	if(generator.status() != good) continue;
	assert(ev);
	ev->central().weight *= invGeV2_to_pb;
	ev->central().weight /= config.events;

	xs += ev->central().weight;
	xs_err += ev->central().weight*ev->central().weight;
	}
	xs_err = std::sqrt(xs_err);
	std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << '\n';

	assert(std::abs(xs - xs_ref) < 3*xs_err);
	assert(xs_err < 0.01*xs);
	return EXIT_SUCCESS;
	}
	diff --git a/FixedOrderGen/t/4j.cc b/FixedOrderGen/t/4j.cc
	index 8d9aa41..b9fdef1 100644
	--- a/FixedOrderGen/t/4j.cc
	+++ b/FixedOrderGen/t/4j.cc
	@@ -1,68 +1,68 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#ifdef NDEBUG
	#undef NDEBUG
	#endif

	#include <algorithm>
	#include <cmath>
	#include <cassert>
	#include <iostream>

	#include "config.hh"
	#include "EventGenerator.hh"
	#include "HEJ/Mixmax.hh"

	#include "HEJ/Event.hh"
	#include "HEJ/PDF.hh"
	#include "HEJ/MatrixElement.hh"

	using namespace HEJFOG;

	int main(){
	constexpr double invGeV2_to_pb = 389379292.;
	constexpr double xs_ref = 0.81063619*1e6; //calculated with "combined" HEJ svn r3480

	auto config = load_config("config_2j.yml");
	config.process.njets = 4;

	HEJ::Mixmax ran{};
	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	HEJ::ScaleGenerator{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	},
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	ran
	};

	double xs = 0., xs_err = 0.;
	for (int trials = 0; trials < config.events; ++trials){
	auto ev = generator.gen_event();
	if(generator.status() != good) continue;
	assert(ev);
	ev->central().weight *= invGeV2_to_pb;
	ev->central().weight /= config.events;

	xs += ev->central().weight;
	xs_err += ev->central().weight*ev->central().weight;
	}
	xs_err = std::sqrt(xs_err);
	std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << '\n';

	assert(std::abs(xs - xs_ref) < 3*xs_err);
	assert(xs_err < 0.03*xs);
	return EXIT_SUCCESS;
	}
	diff --git a/FixedOrderGen/t/W_reconstruct_enu.cc b/FixedOrderGen/t/W_reconstruct_enu.cc
	index 8af3615..badb36a 100644
	--- a/FixedOrderGen/t/W_reconstruct_enu.cc
	+++ b/FixedOrderGen/t/W_reconstruct_enu.cc
	@@ -1,72 +1,72 @@
	/**
	* \brief that the reconstruction of the W works
	*
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#ifdef NDEBUG
	#undef NDEBUG
	#endif

	#include <algorithm>

	#include "config.hh"
	#include "EventGenerator.hh"

	#include "HEJ/Event.hh"
	#include "HEJ/Mixmax.hh"

	using namespace HEJFOG;
	using namespace HEJ;
	namespace {
	constexpr size_t num_events = 1000;
	constexpr double invGeV2_to_pb = 389379292.;
	}

	double get_xs(std::string config_name){
	auto config { load_config(config_name) };
	config.events = num_events;
	HEJ::Mixmax ran{1};
	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	HEJ::ScaleGenerator{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	},
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	ran
	};

	double xs = 0.;
	for (int trials = 0; trials < config.events; ++trials){
	auto ev = generator.gen_event();
	if(generator.status() != good) continue;
	assert(ev);
	ev->central().weight *= invGeV2_to_pb;
	ev->central().weight /= config.events;
	xs += ev->central().weight;
	}
	return xs;
	}

	int main(){

	double xs_W{ get_xs("config_Wp_2j.yml")};
	double xs_enu{ get_xs("config_Wp_2j_decay.yml")};
	if(std::abs(xs_W/xs_enu-1.)>1e-6){
	std::cerr << "Reconstructing the W in the runcard gave a different results ("
	<< xs_W << " vs. "<< xs_enu << " -> " << std::abs(xs_W/xs_enu-1.)*100 << "%)\n";
	return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
	}
	diff --git a/FixedOrderGen/t/h_2j.cc b/FixedOrderGen/t/h_2j.cc
	index 18c11d0..e993a8d 100644
	--- a/FixedOrderGen/t/h_2j.cc
	+++ b/FixedOrderGen/t/h_2j.cc
	@@ -1,75 +1,75 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#ifdef NDEBUG
	#undef NDEBUG
	#endif

	#include <algorithm>
	#include <cmath>
	#include <cassert>
	#include <iostream>

	#include "config.hh"
	#include "EventGenerator.hh"
	#include "HEJ/Mixmax.hh"

	#include "HEJ/Event.hh"
	#include "HEJ/PDF.hh"
	#include "HEJ/MatrixElement.hh"

	using namespace HEJFOG;

	int main(){
	constexpr double invGeV2_to_pb = 389379292.;
	constexpr double xs_ref = 2.04928; // +- 0.00377252
	//calculated with HEJ revision 9570e3809613272ac4b8bf3236279ba23cf64d20

	auto config = load_config("config_h_2j.yml");

	HEJ::Mixmax ran{};
	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	HEJ::ScaleGenerator{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	},
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	ran
	};

	double xs = 0., xs_err = 0.;
	for (int trials = 0; trials < config.events; ++trials){
	auto ev = generator.gen_event();
	if(generator.status() != good) continue;
	assert(ev);
	ev->central().weight *= invGeV2_to_pb;
	ev->central().weight /= config.events;

	const auto the_Higgs = std::find_if(
	begin(ev->outgoing()), end(ev->outgoing()),
	[](HEJ::Particle const & p){ return p.type == HEJ::ParticleID::h; }
	);
	assert(the_Higgs != end(ev->outgoing()));
	if(std::abs(the_Higgs->rapidity()) > 5.) continue;

	xs += ev->central().weight;
	xs_err += ev->central().weight*ev->central().weight;
	}
	xs_err = std::sqrt(xs_err);
	std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << std::endl;

	assert(std::abs(xs - xs_ref) < 3*xs_err);
	assert(xs_err < 0.01*xs);
	return EXIT_SUCCESS;
	}
	diff --git a/FixedOrderGen/t/h_2j_decay.cc b/FixedOrderGen/t/h_2j_decay.cc
	index 8774f18..0d25f19 100644
	--- a/FixedOrderGen/t/h_2j_decay.cc
	+++ b/FixedOrderGen/t/h_2j_decay.cc
	@@ -1,94 +1,94 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#ifdef NDEBUG
	#undef NDEBUG
	#endif

	#include <algorithm>
	#include <cmath>
	#include <cassert>
	#include <iostream>

	#include "config.hh"
	#include "EventGenerator.hh"

	#include "HEJ/Event.hh"
	#include "HEJ/MatrixElement.hh"
	#include "HEJ/Particle.hh"
	#include "HEJ/PDF.hh"
	#include "HEJ/Ranlux64.hh"
	#include "HEJ/utility.hh"

	using namespace HEJFOG;

	bool pass_dR_cut(
	std::vector<fastjet::PseudoJet> const & jets,
	std::vector<HEJ::Particle> const & photons
	){
	constexpr double delta_R_min = 0.7;
	for(auto const & jet: jets){
	for(auto const & photon: photons){
	if(jet.delta_R(photon.p) < delta_R_min) return false;
	}
	}
	return true;
	}

	int main(){
	constexpr double invGeV2_to_pb = 389379292.;
	constexpr double xs_ref = 0.00429198; // +- 1.0488e-05
	//calculated with HEJ revision 9570e3809613272ac4b8bf3236279ba23cf64d20

	auto config = load_config("config_h_2j_decay.yml");

	HEJ::Ranlux64 ran{};
	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	HEJ::ScaleGenerator{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	},
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	ran
	};

	double xs = 0., xs_err = 0.;
	for (int trials = 0; trials < config.events; ++trials){
	auto ev = generator.gen_event();
	if(generator.status() != good) continue;
	assert(ev);
	assert(ev->decays().size() == 1);
	const auto decay = begin(ev->decays());
	assert(ev->outgoing().size() > decay->first);
	const auto & the_Higgs = ev->outgoing()[decay->first];
	assert(the_Higgs.type == HEJ::pid::Higgs);
	assert(decay->second.size() == 2);
	auto const & gamma = decay->second;
	assert(gamma[0].type == HEJ::pid::photon);
	assert(gamma[1].type == HEJ::pid::photon);
	assert(HEJ::nearby_ep(gamma[0].p + gamma[1].p, the_Higgs.p, 1e-6));
	if(!pass_dR_cut(ev->jets(), gamma)) continue;
	ev->central().weight *= invGeV2_to_pb;
	ev->central().weight /= config.events;

	xs += ev->central().weight;
	xs_err += ev->central().weight*ev->central().weight;
	}
	xs_err = std::sqrt(xs_err);
	std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << std::endl;

	assert(std::abs(xs - xs_ref) < 3*xs_err);
	assert(xs_err < 0.012*xs);
	return EXIT_SUCCESS;
	}
	diff --git a/FixedOrderGen/t/h_3j.cc b/FixedOrderGen/t/h_3j.cc
	index c4a9e8a..8d134ca 100644
	--- a/FixedOrderGen/t/h_3j.cc
	+++ b/FixedOrderGen/t/h_3j.cc
	@@ -1,76 +1,76 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#ifdef NDEBUG
	#undef NDEBUG
	#endif

	#include <algorithm>
	#include <cmath>
	#include <cassert>
	#include <iostream>

	#include "config.hh"
	#include "EventGenerator.hh"
	#include "HEJ/Ranlux64.hh"

	#include "HEJ/Event.hh"
	#include "HEJ/MatrixElement.hh"
	#include "HEJ/PDF.hh"

	using namespace HEJFOG;

	int main(){
	constexpr double invGeV2_to_pb = 389379292.;
	constexpr double xs_ref = 1.07807; // +- 0.0071
	//calculated with HEJ revision 93efdc851b02a907a6fcc63956387f9f4c1111c2 +1

	auto config = load_config("config_h_2j.yml");
	config.process.njets = 3;

	HEJ::Ranlux64 ran{};
	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	HEJ::ScaleGenerator{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	},
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	ran
	};

	double xs = 0., xs_err = 0.;
	for (int trials = 0; trials < config.events; ++trials){
	auto ev = generator.gen_event();
	if(generator.status() != good) continue;
	assert(ev);
	ev->central().weight *= invGeV2_to_pb;
	ev->central().weight /= config.events;

	const auto the_Higgs = std::find_if(
	begin(ev->outgoing()), end(ev->outgoing()),
	[](HEJ::Particle const & p){ return p.type == HEJ::ParticleID::h; }
	);
	assert(the_Higgs != end(ev->outgoing()));
	if(std::abs(the_Higgs->rapidity()) > 5.) continue;

	xs += ev->central().weight;
	xs_err += ev->central().weight*ev->central().weight;
	}
	xs_err = std::sqrt(xs_err);
	std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << std::endl;

	assert(std::abs(xs - xs_ref) < 3*xs_err);
	assert(xs_err < 0.02*xs);
	return EXIT_SUCCESS;
	}
	diff --git a/FixedOrderGen/t/h_3j_uno1.cc b/FixedOrderGen/t/h_3j_uno1.cc
	index 0befb62..94bc80e 100644
	--- a/FixedOrderGen/t/h_3j_uno1.cc
	+++ b/FixedOrderGen/t/h_3j_uno1.cc
	@@ -1,80 +1,80 @@
	/**
	* check that adding uno emissions doesn't change the FKL cross section
	*
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#ifdef NDEBUG
	#undef NDEBUG
	#endif

	#include <algorithm>
	#include <cassert>
	#include <cmath>
	#include <iostream>

	#include "config.hh"
	#include "EventGenerator.hh"
	#include "HEJ/Ranlux64.hh"
	#include "Subleading.hh"

	#include "HEJ/Event.hh"
	#include "HEJ/MatrixElement.hh"
	#include "HEJ/PDF.hh"

	using namespace HEJFOG;

	int main(){
	constexpr double invGeV2_to_pb = 389379292.;
	constexpr double xs_ref = 0.0243548; // +- 0.000119862
	//calculated with HEJ revision 9570e3809613272ac4b8bf3236279ba23cf64d20

	auto config = load_config("config_h_2j.yml");
	config.process.njets = 3;
	config.process.incoming = {HEJ::pid::u, HEJ::pid::u};
	config.subleading_channels = HEJFOG::Subleading::uno;

	HEJ::Ranlux64 ran{};
	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	HEJ::ScaleGenerator{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	},
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	ran
	};

	double xs = 0., xs_err = 0.;
	int uno_found = 0;
	for (int trials = 0; trials < config.events; ++trials){
	auto ev = generator.gen_event();
	if(generator.status() != good) continue;
	assert(ev);
	if(ev->type() != HEJ::event_type::FKL){
	++uno_found;
	continue;
	}
	ev->central().weight *= invGeV2_to_pb;
	ev->central().weight /= config.events;

	xs += ev->central().weight;
	xs_err += ev->central().weight*ev->central().weight;
	}
	xs_err = std::sqrt(xs_err);
	std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << '\n';
	std::cout << uno_found << " events with unordered emission" << std::endl;
	assert(uno_found > 0);
	assert(std::abs(xs - xs_ref) < 3*xs_err);
	assert(xs_err < 0.05*xs);
	return EXIT_SUCCESS;
	}
	diff --git a/FixedOrderGen/t/h_3j_uno2.cc b/FixedOrderGen/t/h_3j_uno2.cc
	index 3cb4ae7..ab069d9 100644
	--- a/FixedOrderGen/t/h_3j_uno2.cc
	+++ b/FixedOrderGen/t/h_3j_uno2.cc
	@@ -1,75 +1,75 @@
	/**
	* check uno cross section
	*
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#ifdef NDEBUG
	#undef NDEBUG
	#endif

	#include <algorithm>
	#include <cassert>
	#include <cmath>
	#include <iostream>

	#include "config.hh"
	#include "EventGenerator.hh"
	#include "HEJ/Ranlux64.hh"
	#include "Subleading.hh"

	#include "HEJ/Event.hh"
	#include "HEJ/MatrixElement.hh"
	#include "HEJ/PDF.hh"

	using namespace HEJFOG;

	int main(){
	constexpr double invGeV2_to_pb = 389379292.;
	constexpr double xs_ref = 0.00347538; // +- 3.85875e-05
	//calculated with HEJ revision 9570e3809613272ac4b8bf3236279ba23cf64d20

	auto config = load_config("config_h_2j.yml");
	config.process.njets = 3;
	config.process.incoming = {HEJ::pid::u, HEJ::pid::u};
	config.subleading_fraction = 1.;
	config.subleading_channels = HEJFOG::Subleading::uno;

	HEJ::Ranlux64 ran{};
	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	HEJ::ScaleGenerator{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	},
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	ran
	};

	double xs = 0., xs_err = 0.;
	for (int trials = 0; trials < config.events; ++trials){
	auto ev = generator.gen_event();
	if(generator.status() != good) continue;
	assert(ev);
	if(ev->type() == HEJ::event_type::FKL) continue;
	ev->central().weight *= invGeV2_to_pb;
	ev->central().weight /= config.events;

	xs += ev->central().weight;
	xs_err += ev->central().weight*ev->central().weight;
	}
	xs_err = std::sqrt(xs_err);
	std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << std::endl;
	assert(std::abs(xs - xs_ref) < 3*xs_err);
	assert(xs_err < 0.05*xs);
	return EXIT_SUCCESS;
	}
	diff --git a/FixedOrderGen/t/h_5j.cc b/FixedOrderGen/t/h_5j.cc
	index d6d3ffa..cbcd7a2 100644
	--- a/FixedOrderGen/t/h_5j.cc
	+++ b/FixedOrderGen/t/h_5j.cc
	@@ -1,72 +1,72 @@
	/**
	* This is a regression test
	* the reference cross section has not been checked against any other program
	*
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#ifdef NDEBUG
	#undef NDEBUG
	#endif

	#include <algorithm>
	#include <cassert>
	#include <cmath>
	#include <iostream>

	#include "config.hh"
	#include "EventGenerator.hh"
	#include "HEJ/Ranlux64.hh"

	#include "HEJ/Event.hh"
	#include "HEJ/MatrixElement.hh"
	#include "HEJ/PDF.hh"

	using namespace HEJFOG;

	int main(){
	constexpr double invGeV2_to_pb = 389379292.;
	constexpr double xs_ref = 0.252273; // +- 0.00657742
	//calculated with HEJ revision 9570e3809613272ac4b8bf3236279ba23cf64d20

	auto config = load_config("config_h_2j.yml");
	config.process.njets = 5;

	HEJ::Ranlux64 ran{};
	HEJFOG::EventGenerator generator{
	config.process,
	config.beam,
	HEJ::ScaleGenerator{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	},
	config.jets,
	config.pdf_id,
	config.subleading_fraction,
	config.subleading_channels,
	- config.particles_decays,
	+ config.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	ran
	};

	double xs = 0., xs_err = 0.;
	for (int trials = 0; trials < config.events; ++trials){
	auto ev = generator.gen_event();
	if(generator.status() != good) continue;
	assert(ev);
	ev->central().weight *= invGeV2_to_pb;
	ev->central().weight /= config.events;

	xs += ev->central().weight;
	xs_err += ev->central().weight*ev->central().weight;
	}
	xs_err = std::sqrt(xs_err);
	std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << std::endl;

	assert(std::abs(xs - xs_ref) < 3*xs_err);
	assert(xs_err < 0.06*xs);
	return EXIT_SUCCESS;
	}

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