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	diff --git a/include/HEJ/Event.hh b/include/HEJ/Event.hh
	index 42db081..44f3cb3 100644
	--- a/include/HEJ/Event.hh
	+++ b/include/HEJ/Event.hh
	@@ -1,364 +1,370 @@
	/** \file
	* \brief Declares the Event class and helpers
	*
	* \authors Jeppe Andersen, Tuomas Hapola, Marian Heil, Andreas Maier, Jennifer Smillie
	* \date 2019
	* \copyright GPLv2 or later
	*/

	#pragma once

	#include <array>
	#include <string>
	#include <unordered_map>
	#include <vector>

	#include "HEJ/event_types.hh"
	#include "HEJ/Parameters.hh"
	#include "HEJ/Particle.hh"

	#include "fastjet/ClusterSequence.hh"

	namespace LHEF{
	class HEPEUP;
	class HEPRUP;
	}

	namespace fastjet{
	class JetDefinition;
	}

	namespace HEJ{

	struct UnclusteredEvent;

	/** @brief An event with clustered jets
	*
	* This is the main HEJ 2 event class.
	* It contains kinematic information including jet clustering,
	* parameter (e.g. scale) settings and the event weight.
	*
	* \note Use EventData to build this class.
	* There is no other constructor available.
	*/
	class Event{
	public:
	class EventData;
	//! No default Constructor
	Event() = delete;
	//! Event Constructor adding jet clustering to an unclustered event
	//! @deprecated UnclusteredEvent will be replaced by EventData in HEJ 2.3.0
	[[deprecated("UnclusteredEvent will be replaced by EventData")]]
	Event(
	UnclusteredEvent const & ev,
	fastjet::JetDefinition const & jet_def, double min_jet_pt
	);


	//! The jets formed by the outgoing partons
	std::vector<fastjet::PseudoJet> jets() const;

	//! The corresponding event before jet clustering
	// [[deprecated]]
	// UnclusteredEvent unclustered() const {
	// return UnclusteredEvent(ev_);
	// TODO what to do with this?
	// }

	//! Incoming particles
	std::array<Particle, 2> const & incoming() const{
	return incoming_;
	}
	//! Outgoing particles
	std::vector<Particle> const & outgoing() const{
	return outgoing_;
	}
	//! Particle decays
	/**
	* The key in the returned map corresponds to the index in the
	* vector returned by outgoing()
	*/
	std::unordered_map<size_t, std::vector<Particle>> const & decays() const{
	return decays_;
	}

	+ //! All chosen parameter, i.e. scale choices (const version)
	+ Parameters<EventParameters> const & parameters() const{
	+ return parameters_;
	+ }
	+ //! All chosen parameter, i.e. scale choices
	+ Parameters<EventParameters> & parameters(){
	+ return parameters_;
	+ }
	+
	//! Central parameter choice (const version)
	EventParameters const & central() const{
	- return central_;
	+ return parameters_.central;
	}
	//! Central parameter choice
	EventParameters & central(){
	- return central_;
	+ return parameters_.central;
	}

	//! Parameter (scale) variations (const version)
	std::vector<EventParameters> const & variations() const{
	- return variations_;
	+ return parameters_.variations;
	}
	//! Parameter (scale) variations
	std::vector<EventParameters> & variations(){
	- return variations_;
	+ return parameters_.variations;
	}

	//! Parameter (scale) variation (const version)
	/**
	* @param i Index of the requested variation
	*/
	EventParameters const & variations(size_t i) const{
	- return variations_[i];
	+ return parameters_.variations[i];
	}
	//! Parameter (scale) variation
	/**
	* @param i Index of the requested variation
	*/
	EventParameters & variations(size_t i){
	- return variations_[i];
	+ return parameters_.variations[i];
	}

	//! Indices of the jets the outgoing partons belong to
	/**
	* @param jets Jets to be tested
	* @returns A vector containing, for each outgoing parton,
	* the index in the vector of jets the considered parton
	* belongs to. If the parton is not inside any of the
	* passed jets, the corresponding index is set to -1.
	*/
	std::vector<int> particle_jet_indices(
	std::vector<fastjet::PseudoJet> const & jets
	) const{
	return cs_.particle_jet_indices(jets);
	}

	//! Jet definition used for clustering
	fastjet::JetDefinition const & jet_def() const{
	return cs_.jet_def();
	}

	//! Minimum jet transverse momentum
	double min_jet_pt() const{
	return min_jet_pt_;
	}

	//! Event type
	event_type::EventType type() const{
	return type_;
	}

	private:
	//! \internal
	//! @brief Construct Event explicitly from input.
	/** This is only intended to be called from EventData.
	*
	* \warning The input is taken _as is_, sorting and classification has to be
	* done externally, i.e. by EventData
	*/
	Event(
	std::array<Particle, 2> && incoming,
	std::vector<Particle> && outgoing,
	std::unordered_map<size_t, std::vector<Particle>> && decays,
	- EventParameters && central,
	- std::vector<EventParameters> && variations,
	+ Parameters<EventParameters> && parameters,
	fastjet::JetDefinition const & jet_def,
	double const min_jet_pt
	): incoming_{incoming},
	outgoing_{outgoing},
	decays_{decays},
	- central_{central},
	- variations_{variations},
	+ parameters_{parameters},
	cs_{ to_PseudoJet( filter_partons(outgoing_) ), jet_def },
	min_jet_pt_{min_jet_pt}
	{};

	std::array<Particle, 2> incoming_;
	std::vector<Particle> outgoing_;
	std::unordered_map<size_t, std::vector<Particle>> decays_;
	- //! @TODO replace this by "ParameterVariations"
	- EventParameters central_;
	- //! @TODO replace this by "ParameterVariations"
	- std::vector<EventParameters> variations_;
	+ Parameters<EventParameters> parameters_;
	fastjet::ClusterSequence cs_;
	double min_jet_pt_;
	event_type::EventType type_;
	}; // end class Event

	//! Class to store general Event setup, i.e. Phase space and weights
	class Event::EventData{
	public:
	//! Default Constructor
	EventData() = default;
	//! Constructor from LesHouches event information
	EventData(LHEF::HEPEUP const & hepeup);
	//! Constructor with all values given
	EventData(
	std::array<Particle, 2> const & incoming,
	std::vector<Particle> const & outgoing,
	std::unordered_map<size_t, std::vector<Particle>> const & decays,
	- EventParameters const & central,
	- std::vector<EventParameters> const & variations
	+ Parameters<EventParameters> && parameters
	):
	incoming_(std::move(incoming)), outgoing_(std::move(outgoing)),
	- decays_(std::move(decays)),
	- central_(std::move(central)), variations_(std::move(variations))
	+ decays_(std::move(decays)), parameters_(std::move(parameters))
	{};
	//! Move Constructor with all values given
	EventData(
	std::array<Particle, 2> && incoming,
	std::vector<Particle> && outgoing,
	std::unordered_map<size_t, std::vector<Particle>> && decays,
	- EventParameters && central,
	- std::vector<EventParameters> && variations
	+ Parameters<EventParameters> && parameters
	):
	incoming_(std::move(incoming)), outgoing_(std::move(outgoing)),
	- decays_(std::move(decays)),
	- central_(std::move(central)), variations_(std::move(variations))
	+ decays_(std::move(decays)), parameters_(std::move(parameters))
	{};

	//! Generate an Event from the stored EventData.
	/**
	* @details Do jet clustering and classification.
	* Use this to generate an Event.
	*
	* @note Calling this function destroys EventData
	*
	* @param jet_def Jet definition
	* @param min_jet_pt minimal \f$p_T\f$ for each jet
	*
	* @returns Full clustered and classified event.
	*/
	Event cluster(
	fastjet::JetDefinition const & jet_def, double const min_jet_pt);

	//! Alias for cluster()
	Event operator()(
	fastjet::JetDefinition const & jet_def, double const min_jet_pt){
	return cluster(jet_def, min_jet_pt);
	};

	//! Sort particles in rapidity
	void sort();

	//! Get Incoming Particles
	std::array<Particle, 2> const & get_incoming() const{
	return incoming_;
	}
	//! Set Incoming Particles
	void set_incoming(std::array<Particle, 2> const & in){
	incoming_ = in;
	}
	//! Set Incoming Particles by index
	void set_incoming(Particle const & in, size_t i){
	if(i>1) throw std::out_of_range("Can only set incoming particle 0 or 1.");
	incoming_[i] = in;
	}

	//! Get Outgoing Particles
	std::vector<Particle> const & get_outgoing() const{
	return outgoing_;
	}
	//! Set Outgoing Particles
	void set_outgoing(std::vector<Particle> const & out){
	outgoing_ = out;
	}
	//! Replace Outgoing Particles at index i
	void replace_outgoing(Particle const & out, size_t i){
	if(i>=outgoing_.size()) throw std::out_of_range(
	"Can not replace outgoing particle; not set before.");
	outgoing_[i] = out;
	}
	//! Add an Outgoing Particle to the end
	void add_outgoing(Particle const & out){
	outgoing_.push_back(out);
	}
	//! Add an Outgoing Particle to the end (move version)
	void add_outgoing(Particle && out){
	outgoing_.push_back(out);
	}

	//! Get Particle decays in the format {outgoing index, decay products}
	std::unordered_map<size_t, std::vector<Particle>> const & get_decays() const{
	return decays_;
	}
	//! Set Particle decays in the format {outgoing index, decay products}
	void set_decays(
	std::unordered_map<size_t, std::vector<Particle>> const & decays
	){
	decays_ = decays;
	}
	//! Add a Particle decay
	//! @note this will replace previously set decays if out_idx is already used
	void add_decay(
	size_t const out_idx, std::vector<Particle> const & products
	){
	decays_[out_idx] = products;
	}

	- //! Get Central parameter (e.g. scale) choice
	+ //! Get all parameters, i.e. scale choices
	+ Parameters<EventParameters> const & get_parameters() const{
	+ return parameters_;
	+ }
	+ //! Set all parameters, i.e. scale choices
	+ void set_parameters(Parameters<EventParameters> const & parameters){
	+ parameters_ = parameters;
	+ }
	+
	+ //! Get central parameter choice
	EventParameters const & get_central() const{
	- return central_;
	+ return parameters_.central;
	}
	- //! Set Central parameter (e.g. scale) choice
	+ //! Set central parameter choice
	void set_central(EventParameters const & central){
	- central_ = central;
	+ parameters_.central = central;
	}

	- //! Get parameter variation
	+ //! Get parameter (scale) variations
	std::vector<EventParameters> const & get_variations() const{
	- return variations_;
	+ return parameters_.variations;
	}
	- //! Set parameter variation
	+ //! Set parameter (scale) variations
	void set_variations(std::vector<EventParameters> const & variations){
	- variations_ = variations;
	+ parameters_.variations = variations;
	}
	- //! Replace parameter variation at index i
	+ //! Replace parameter (scale) variation at index i
	void replace_variation(EventParameters const & variation, size_t i){
	- if(i>=outgoing_.size()) throw std::out_of_range(
	+ if(i>=parameters_.variations.size()) throw std::out_of_range(
	"Can not replace variation; not set before.");
	- variations_[i] = variation;
	+ parameters_.variations[i] = variation;
	}
	- //! Add a parameter variation to the end
	+ //! Add a parameter (scale) variation to the end
	void add_variation(EventParameters const & variation){
	- variations_.push_back(variation);
	+ parameters_.variations.push_back(variation);
	}
	- //! Add a parameter variation to the end (move version)
	+ //! Add a parameter (scale) variation to the end (move version)
	void add_variation(EventParameters && variation){
	- variations_.push_back(variation);
	+ parameters_.variations.push_back(variation);
	}

	private:
	std::array<Particle, 2> incoming_;
	std::vector<Particle> outgoing_;
	std::unordered_map<size_t, std::vector<Particle>> decays_;
	- //! @TODO replace this by "ParameterVariations"
	- EventParameters central_;
	- //! @TODO replace this by "ParameterVariations"
	- std::vector<EventParameters> variations_;
	+ Parameters<EventParameters> parameters_;
	}; // end class EventData

	//! Square of the partonic centre-of-mass energy \f$\hat{s}\f$
	double shat(Event const & ev);

	//! Convert an event to a LHEF::HEPEUP
	LHEF::HEPEUP to_HEPEUP(Event const & event, LHEF::HEPRUP *);

	// put deprecated warning at the end, so don't get the warning inside Event.hh,
	// additionally doxygen can not identify [[deprecated]] correctly
	struct [[deprecated("UnclusteredEvent will be replaced by EventData")]]
	UnclusteredEvent;
	//! An event before jet clustering
	//! @deprecated UnclusteredEvent will be replaced by EventData in HEJ 2.3.0
	struct UnclusteredEvent{
	//! Default Constructor
	UnclusteredEvent() = default;
	//! Constructor from LesHouches event information
	UnclusteredEvent(LHEF::HEPEUP const & hepeup);

	std::array<Particle, 2> incoming; /*< Incoming Particles /
	std::vector<Particle> outgoing; /*< Outgoing Particles /
	//! Particle decays in the format {outgoing index, decay products}
	std::unordered_map<size_t, std::vector<Particle>> decays;
	//! Central parameter (e.g. scale) choice
	EventParameters central;
	std::vector<EventParameters> variations; /*< For parameter variation /
	};

	}
	diff --git a/src/Event.cc b/src/Event.cc
	index dd97a9f..52095f6 100644
	--- a/src/Event.cc
	+++ b/src/Event.cc
	@@ -1,406 +1,407 @@
	/**
	* \authors Jeppe Andersen, Tuomas Hapola, Marian Heil, Andreas Maier, Jennifer Smillie
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include "HEJ/Event.hh"

	#include <algorithm>
	#include <assert.h>
	#include <numeric>
	#include <utility>

	#include "LHEF/LHEF.h"

	#include "fastjet/JetDefinition.hh"

	#include "HEJ/exceptions.hh"
	#include "HEJ/PDG_codes.hh"

	namespace HEJ{

	namespace{
	constexpr int status_in = -1;
	constexpr int status_decayed = 2;
	constexpr int status_out = 1;

	/// @name helper functions to determine event type
	//@{

	/**
	* \brief check if final state valid for HEJ
	*
	* check if there is at most one photon, W, H, Z in the final state
	* and all the rest are quarks or gluons
	*/
	bool final_state_ok(std::vector<Particle> const & outgoing){
	bool has_AWZH_boson = false;
	for(auto const & out: outgoing){
	if(is_AWZH_boson(out.type)){
	if(has_AWZH_boson) return false;
	has_AWZH_boson = true;
	}
	else if(! is_parton(out.type)) return false;
	}
	return true;
	}

	template<class Iterator>
	Iterator remove_AWZH(Iterator begin, Iterator end){
	return std::remove_if(
	begin, end, [](Particle const & p){return is_AWZH_boson(p);}
	);
	}

	template<class Iterator>
	bool valid_outgoing(Iterator begin, Iterator end){
	return std::distance(begin, end) >= 2
	&& std::is_sorted(begin, end, rapidity_less{})
	&& std::count_if(
	begin, end, [](Particle const & s){return is_AWZH_boson(s);}
	) < 2;
	}

	/// @note that this changes the outgoing range!
	template<class ConstIterator, class Iterator>
	bool is_FKL(
	ConstIterator begin_incoming, ConstIterator end_incoming,
	Iterator begin_outgoing, Iterator end_outgoing
	){
	assert(std::distance(begin_incoming, end_incoming) == 2);
	assert(std::distance(begin_outgoing, end_outgoing) >= 2);

	// One photon, W, H, Z in the final state is allowed.
	// Remove it for remaining tests,
	end_outgoing = remove_AWZH(begin_outgoing, end_outgoing);

	// Test if this is a standard FKL configuration.
	return
	(begin_incoming->type == begin_outgoing->type)
	&& ((end_incoming-1)->type == (end_outgoing-1)->type)
	&& std::all_of(
	begin_outgoing + 1, end_outgoing - 1,
	[](Particle const & p){ return p.type == pid::gluon; }
	);
	}

	bool is_FKL(
	std::array<Particle, 2> const & incoming,
	std::vector<Particle> outgoing
	){
	assert(std::is_sorted(begin(incoming), end(incoming), pz_less{}));
	assert(valid_outgoing(begin(outgoing), end(outgoing)));

	return is_FKL(
	begin(incoming), end(incoming),
	begin(outgoing), end(outgoing)
	);
	}

	bool has_2_jets(Event const & event){
	return event.jets().size() >= 2;
	}

	/**
	* \brief Checks whether event is unordered backwards
	* @param ev Event
	* @returns Is Event Unordered Backwards
	*
	* - Checks there is more than 3 constuents in the final state
	* - Checks there is more than 3 jets
	* - Checks the most backwards parton is a gluon
	* - Checks the most forwards jet is not a gluon
	* - Checks the rest of the event is FKL
	* - Checks the second most backwards is not a different boson
	* - Checks the unordered gluon actually forms a jet
	*/
	bool is_unordered_backward(Event const & ev){
	auto const & in = ev.incoming();
	auto const & out = ev.outgoing();
	assert(std::is_sorted(begin(in), end(in), pz_less{}));
	assert(valid_outgoing(begin(out), end(out)));

	if(out.size() < 3) return false;
	if(ev.jets().size() < 3) return false;
	if(in.front().type == pid::gluon) return false;
	if(out.front().type != pid::gluon) return false;
	// When skipping the unordered emission
	// the remainder should be a regular FKL event,
	// except that the (new) first outgoing particle must not be a A,W,Z,H.
	const auto FKL_begin = next(begin(out));
	if(is_AWZH_boson(*FKL_begin)) return false;
	if(!is_FKL(in, {FKL_begin, end(out)})) return false;
	// check that the unordered gluon forms an extra jet
	const auto jets = sorted_by_rapidity(ev.jets());
	const auto indices = ev.particle_jet_indices({jets.front()});
	return indices[0] >= 0 && indices[1] == -1;
	}

	/**
	* \brief Checks for a forward unordered gluon emission
	* @param ev Event
	* @returns Is the event a forward unordered emission
	*
	* \see is_unordered_backward
	*/
	bool is_unordered_forward(Event const & ev){
	auto const & in = ev.incoming();
	auto const & out = ev.outgoing();
	assert(std::is_sorted(begin(in), end(in), pz_less{}));
	assert(valid_outgoing(begin(out), end(out)));

	if(out.size() < 3) return false;
	if(ev.jets().size() < 3) return false;
	if(in.back().type == pid::gluon) return false;
	if(out.back().type != pid::gluon) return false;
	// When skipping the unordered emission
	// the remainder should be a regular FKL event,
	// except that the (new) last outgoing particle must not be a A,W,Z,H.
	const auto FKL_end = prev(end(out));
	if(is_AWZH_boson(*prev(FKL_end))) return false;
	if(!is_FKL(in, {begin(out), FKL_end})) return false;
	// check that the unordered gluon forms an extra jet
	const auto jets = sorted_by_rapidity(ev.jets());
	const auto indices = ev.particle_jet_indices({jets.back()});
	return indices.back() >= 0 && indices[indices.size()-2] == -1;
	}

	using event_type::EventType;

	EventType classify(Event const & ev){
	if(! final_state_ok(ev.outgoing())) return EventType::bad_final_state;
	if(! has_2_jets(ev)) return EventType::no_2_jets;
	if(is_FKL(ev.incoming(), ev.outgoing())) return EventType::FKL;
	if(is_unordered_backward(ev)){
	return EventType::unordered_backward;
	}
	if(is_unordered_forward(ev)){
	return EventType::unordered_forward;
	}
	return EventType::nonHEJ;
	}
	//@}

	Particle extract_particle(LHEF::HEPEUP const & hepeup, int i){
	return Particle{
	static_cast<ParticleID>(hepeup.IDUP[i]),
	fastjet::PseudoJet{
	hepeup.PUP[i][0], hepeup.PUP[i][1],
	hepeup.PUP[i][2], hepeup.PUP[i][3]
	}
	};
	}

	bool is_decay_product(std::pair<int, int> const & mothers){
	if(mothers.first == 0) return false;
	return mothers.second == 0 \|\| mothers.first == mothers.second;
	}

	} // namespace anonymous

	- Event::EventData::EventData(LHEF::HEPEUP const & hepeup):
	- central_(EventParameters{
	- hepeup.scales.mur, hepeup.scales.muf, hepeup.weight()
	- })
	+ Event::EventData::EventData(LHEF::HEPEUP const & hepeup)
	{
	+ parameters_.central = EventParameters{
	+ hepeup.scales.mur, hepeup.scales.muf, hepeup.weight()
	+ };
	size_t in_idx = 0;
	for (int i = 0; i < hepeup.NUP; ++i) {
	// skip decay products
	// we will add them later on, but we have to ensure that
	// the decayed particle is added before
	if(is_decay_product(hepeup.MOTHUP[i])) continue;

	auto particle = extract_particle(hepeup, i);
	// needed to identify mother particles for decay products
	particle.p.set_user_index(i+1);

	if(hepeup.ISTUP[i] == status_in){
	if(in_idx > incoming_.size()) {
	throw std::invalid_argument{
	"Event has too many incoming particles"
	};
	}
	incoming_[in_idx++] = std::move(particle);
	}
	else outgoing_.emplace_back(std::move(particle));
	}

	// add decay products
	for (int i = 0; i < hepeup.NUP; ++i) {
	if(!is_decay_product(hepeup.MOTHUP[i])) continue;
	const int mother_id = hepeup.MOTHUP[i].first;
	const auto mother = std::find_if(
	begin(outgoing_), end(outgoing_),
	[mother_id](Particle const & particle){
	return particle.p.user_index() == mother_id;
	}
	);
	if(mother == end(outgoing_)){
	throw std::invalid_argument{"invalid decay product parent"};
	}
	const int mother_idx = std::distance(begin(outgoing_), mother);
	assert(mother_idx >= 0);
	decays_[mother_idx].emplace_back(extract_particle(hepeup, i));
	}
	}

	//! @TODO remove in HEJ 2.3.0
	Event::Event(
	UnclusteredEvent const & ev,
	fastjet::JetDefinition const & jet_def, double const min_jet_pt
	):
	Event( Event::EventData{
	- ev.incoming, ev.outgoing, ev.decays, ev.central, ev.variations
	+ ev.incoming, ev.outgoing, ev.decays,
	+ Parameters<EventParameters>{ev.central, ev.variations}
	}.cluster(jet_def, min_jet_pt) )
	{}

	//! @TODO remove in HEJ 2.3.0
	UnclusteredEvent::UnclusteredEvent(LHEF::HEPEUP const & hepeup){
	Event::EventData const evData{hepeup};
	incoming = evData.get_incoming();
	outgoing = evData.get_outgoing();
	decays = evData.get_decays();
	central = evData.get_central();
	variations = evData.get_variations();
	}

	void Event::EventData::sort(){
	// sort particles
	std::sort(
	begin(incoming_), end(incoming_),
	[](Particle o1, Particle o2){return o1.p.pz()<o2.p.pz();}
	);

	auto old_outgoing = std::move(outgoing_);
	std::vector<size_t> idx(old_outgoing.size());
	std::iota(idx.begin(), idx.end(), 0);
	std::sort(idx.begin(), idx.end(), [&old_outgoing](size_t i, size_t j){
	return old_outgoing[i].rapidity() < old_outgoing[j].rapidity();
	});
	outgoing_.clear();
	outgoing_.reserve(old_outgoing.size());
	for(size_t i: idx) {
	outgoing_.emplace_back(std::move(old_outgoing[i]));
	}

	// find decays again
	if(!decays_.empty()){
	auto old_decays = std::move(decays_);
	decays_.clear();
	for(size_t i=0; i<idx.size(); ++i) {
	auto decay = old_decays.find(idx[i]);
	if(decay != old_decays.end())
	decays_.emplace(i, std::move(decay->second));
	}
	assert(old_decays.size() == decays_.size());
	}
	}

	Event Event::EventData::cluster(
	fastjet::JetDefinition const & jet_def, double const min_jet_pt
	){
	sort();
	Event ev{ std::move(incoming_), std::move(outgoing_), std::move(decays_),
	- std::move(central_), std::move(variations_),
	+ std::move(parameters_),
	jet_def, min_jet_pt
	};
	assert(std::is_sorted(begin(ev.outgoing_), end(ev.outgoing_),
	rapidity_less{}));
	ev.type_ = classify(ev);
	return ev;
	}

	std::vector<fastjet::PseudoJet> Event::jets() const{
	return cs_.inclusive_jets(min_jet_pt_);
	}

	double shat(Event const & ev){
	return (ev.incoming()[0].p + ev.incoming()[1].p).m2();
	}

	namespace{
	// colour flow according to Les Houches standard
	// TODO: stub
	std::vector<std::pair<int, int>> colour_flow(
	std::array<Particle, 2> const & incoming,
	std::vector<Particle> const & outgoing
	){
	std::vector<std::pair<int, int>> result(
	incoming.size() + outgoing.size()
	);
	for(auto & col: result){
	col = std::make_pair(-1, -1);
	}
	return result;
	}
	}

	LHEF::HEPEUP to_HEPEUP(Event const & event, LHEF::HEPRUP * heprup){
	LHEF::HEPEUP result;
	result.heprup = heprup;
	result.weights = {{event.central().weight, nullptr}};
	for(auto const & var: event.variations()){
	result.weights.emplace_back(var.weight, nullptr);
	}
	size_t num_particles = event.incoming().size() + event.outgoing().size();
	for(auto const & decay: event.decays()) num_particles += decay.second.size();
	result.NUP = num_particles;
	// the following entries are pretty much meaningless
	result.IDPRUP = event.type()+1; // event ID
	result.AQEDUP = 1./128.; // alpha_EW
	//result.AQCDUP = 0.118 // alpha_QCD
	// end meaningless part
	result.XWGTUP = event.central().weight;
	result.SCALUP = event.central().muf;
	result.scales.muf = event.central().muf;
	result.scales.mur = event.central().mur;
	result.scales.SCALUP = event.central().muf;
	result.pdfinfo.p1 = event.incoming().front().type;
	result.pdfinfo.p2 = event.incoming().back().type;
	result.pdfinfo.scale = event.central().muf;
	for(Particle const & in: event.incoming()){
	result.IDUP.emplace_back(in.type);
	result.ISTUP.emplace_back(status_in);
	result.PUP.push_back({in.p[0], in.p[1], in.p[2], in.p[3], in.p.m()});
	result.MOTHUP.emplace_back(0, 0);
	}
	for(size_t i = 0; i < event.outgoing().size(); ++i){
	Particle const & out = event.outgoing()[i];
	result.IDUP.emplace_back(out.type);
	const int status = event.decays().count(i)?status_decayed:status_out;
	result.ISTUP.emplace_back(status);
	result.PUP.push_back({out.p[0], out.p[1], out.p[2], out.p[3], out.p.m()});
	result.MOTHUP.emplace_back(1, 2);
	}
	result.ICOLUP = colour_flow(
	event.incoming(), filter_partons(event.outgoing())
	);
	if(result.ICOLUP.size() < num_particles){
	const size_t AWZH_boson_idx = std::find_if(
	begin(event.outgoing()), end(event.outgoing()),
	[](Particle const & s){ return is_AWZH_boson(s); }
	) - begin(event.outgoing()) + event.incoming().size();
	assert(AWZH_boson_idx <= result.ICOLUP.size());
	result.ICOLUP.insert(
	begin(result.ICOLUP) + AWZH_boson_idx,
	std::make_pair(0,0)
	);
	}
	for(auto const & decay: event.decays()){
	for(auto const out: decay.second){
	result.IDUP.emplace_back(out.type);
	result.ISTUP.emplace_back(status_out);
	result.PUP.push_back({out.p[0], out.p[1], out.p[2], out.p[3], out.p.m()});
	const size_t mother_idx = 1 + event.incoming().size() + decay.first;
	result.MOTHUP.emplace_back(mother_idx, mother_idx);
	result.ICOLUP.emplace_back(0,0);
	}
	}
	assert(result.ICOLUP.size() == num_particles);
	static constexpr double unknown_spin = 9.; //per Les Houches accord
	result.VTIMUP = std::vector<double>(num_particles, unknown_spin);
	result.SPINUP = result.VTIMUP;
	return result;
	}

	}

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