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	diff --git a/FixedOrderGen/src/main.cc b/FixedOrderGen/src/main.cc
	index 22eaa3f..e33dcf8 100644
	--- a/FixedOrderGen/src/main.cc
	+++ b/FixedOrderGen/src/main.cc
	@@ -1,260 +1,261 @@
	/**
	* \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 <cstdint>

	#include "LHEF/LHEF.h"

	#include "yaml-cpp/yaml.h"

	#include <boost/iterator/filter_iterator.hpp>

	#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 "HEJ/Unweighter.hh"

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

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

	constexpr double invGeV2_to_pb = 389379292.;
	}

	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, LHEF::HEPRUP const & heprup
	){
	try{
	return HEJ::get_analysis(parameters, heprup);
	}
	catch(std::exception const & exc){
	std::cerr << "Failed to load analysis: " << exc.what() << '\n';
	std::exit(EXIT_FAILURE);
	}
	}

	template<class Iterator>
	auto make_lowpt_filter(Iterator begin, Iterator end, HEJ::optional<double> peak_pt){
	return boost::make_filter_iterator(
	[peak_pt](HEJ::Event const & ev){
	assert(! ev.jets().empty());
	double min_pt = peak_pt?(*peak_pt):0.;
	const auto softest_jet = fastjet::sorted_by_pt(ev.jets()).back();
	return softest_jet.pt() > min_pt;
	},
	begin, end
	);
	}

	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]);

	- auto ran = HEJ::make_RNG(config.rng.name, config.rng.seed);
	+ std::shared_ptr<HEJ::RNG> 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.particle_decays,
	config.Higgs_coupling,
	config.ew_parameters,
	*ran
	};

	// prepare process information for output
	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};

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

	// warm-up phase to train unweighter
	HEJ::optional<HEJ::Unweighter> unweighter{};
	std::map<HEJFOG::Status, std::uint64_t> status_counter;

	std::vector<HEJ::Event> events;
	std::uint64_t trials = 0;
	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 = HEJ::Unweighter();
	unweighter->set_cut_to_peakwt(
	make_lowpt_filter(events.cbegin(), events.cend(), config.jets.peak_pt),
	make_lowpt_filter(events.cend(), events.cend(), config.jets.peak_pt),
	config.unweight->max_dev
	);
	std::vector<HEJ::Event> unweighted_events;
	for(auto && ev: events) {
	auto unweighted = unweighter->unweight(std::move(ev), *ran);
	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";
	} // end unweighting warm-up

	// main generation loop
	// event weight is wrong, need to divide by "total number of trials" afterwards
	HEJ::ProgressBar<size_t> progress{std::cout, config.events};
	progress.increment(events.size());
	events.reserve(config.events);

	for(; events.size() < 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), ran);
	if(! unweighted) continue;
	ev = std::move(unweighted);
	}
	events.emplace_back(std::move(*ev));
	++progress;
	}
	}
	std::cout << std::endl;

	// final run though events with correct weight
	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();

	// Print final informations
	const std::chrono::duration<double> run_time = (clock::now() - start_time);
	std::cout << "\nTask Runtime: " << run_time.count() << " seconds for "
	<< events.size() << " Events (" << events.size()/run_time.count()
	<< " evts/s)\n" << std::endl;

	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 << "%" << std::endl;
	}

	return EXIT_SUCCESS;
	}
	diff --git a/include/HEJ/make_RNG.hh b/include/HEJ/make_RNG.hh
	index ec7c026..814b6c2 100644
	--- a/include/HEJ/make_RNG.hh
	+++ b/include/HEJ/make_RNG.hh
	@@ -1,32 +1,32 @@
	/** \file
	* \brief Declares a factory function for random number generators
	*
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#pragma once

	#include <memory>
	#include <string>

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

	namespace HEJ {
	//! Factory function for random number generators
	/**
	* @param name Name of the random number generator
	* @param seed Optional seed
	* @returns A pointer to an instance of a random number generator
	*
	* At present, name should be one of "ranlux64" or "mixmax" (case insensitive).
	* The interpretation of the seed depends on the random number generator.
	* For ranlux64, it is the name of a seed file. For mixmax it should be a
	* string convertible to a long integer.
	*/
	- std::unique_ptr<HEJ::RNG> make_RNG(
	+ std::unique_ptr<RNG> make_RNG(
	std::string const & name,
	optional<std::string> const & seed
	);
	}
	diff --git a/src/bin/HEJ.cc b/src/bin/HEJ.cc
	index ccc20ff..dedb462 100644
	--- a/src/bin/HEJ.cc
	+++ b/src/bin/HEJ.cc
	@@ -1,375 +1,376 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include <array>
	#include <chrono>
	#include <iostream>
	#include <limits>
	#include <memory>
	#include <numeric>

	#include "yaml-cpp/yaml.h"

	#include "fastjet/ClusterSequence.hh"

	#include "HEJ/CombinedEventWriter.hh"
	#include "HEJ/Config.hh"
	#include "HEJ/CrossSectionAccumulator.hh"
	#include "HEJ/Event.hh"
	#include "HEJ/EventReader.hh"
	#include "HEJ/BufferedEventReader.hh"
	#include "HEJ/EventReweighter.hh"
	#include "HEJ/get_analysis.hh"
	#include "HEJ/make_RNG.hh"
	#include "HEJ/optional.hh"
	#include "HEJ/ProgressBar.hh"
	#include "HEJ/stream.hh"
	#include "HEJ/Unweighter.hh"
	#include "HEJ/Version.hh"
	#include "HEJ/YAMLreader.hh"

	HEJ::Config load_config(char const * filename){
	try{
	return HEJ::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, LHEF::HEPRUP const & heprup
	){
	try{
	return HEJ::get_analysis(parameters, heprup);
	}
	catch(std::exception const & exc){
	std::cerr << "Failed to load analysis: " << exc.what() << '\n';
	std::exit(EXIT_FAILURE);
	}
	}

	// unique_ptr is a workaround:
	// HEJ::optional is a better fit, but gives spurious errors with g++ 7.3.0
	std::unique_ptr<HEJ::ProgressBar<double>> make_progress_bar(
	std::vector<double> const & xs
	) {
	if(xs.empty()) return {};
	const double Born_xs = std::accumulate(begin(xs), end(xs), 0.);
	return std::make_unique<HEJ::ProgressBar<double>>(std::cout, Born_xs);
	}

	std::string time_to_string(const time_t time){
	char s[30];
	struct tm * p = localtime(&time);
	strftime(s, 30, "%a %b %d %Y %H:%M:%S", p);
	return s;
	}

	HEJ::Event to_event(
	LHEF::HEPEUP const & hepeup,
	HEJ::JetParameters const & fixed_order_jets
	) {
	HEJ::Event::EventData event_data{hepeup};
	event_data.reconstruct_intermediate();

	return HEJ::Event{
	std::move(event_data).cluster(
	fixed_order_jets.def, fixed_order_jets.min_pt
	)
	};
	}

	void unweight(
	HEJ::Unweighter & unweighter,
	HEJ::WeightType weight_type,
	std::vector<HEJ::Event> & events,
	HEJ::RNG & ran
	) {
	if(weight_type == HEJ::WeightType::unweighted_resum){
	unweighter.set_cut_to_maxwt(events);
	}
	events.erase(
	unweighter.unweight(begin(events), end(events), ran),
	end(events)
	);
	}

	// peek up to nevents events from reader
	std::vector<LHEF::HEPEUP> peek_events(
	HEJ::BufferedEventReader & reader,
	const int nevents
	) {
	std::vector<LHEF::HEPEUP> events;
	while(
	static_cast<int>(events.size()) < nevents
	&& reader.read_event()
	) {
	events.emplace_back(reader.hepeup());
	}
	// put everything back into the reader
	for(auto it = rbegin(events); it != rend(events); ++it) {
	reader.emplace(*it);
	}
	return events;
	}

	void append_resummed_events(
	std::vector<HEJ::Event> & resummation_events,
	HEJ::EventReweighter & reweighter,
	LHEF::HEPEUP const & hepeup,
	const int trials,
	HEJ::JetParameters const & fixed_order_jets
	) {
	const HEJ::Event FO_event = to_event(hepeup, fixed_order_jets);
	if(reweighter.treatment(FO_event.type()) != HEJ::EventTreatment::reweight) {
	return;
	}
	const auto resummed = reweighter.reweight(FO_event, trials);
	resummation_events.insert(
	end(resummation_events),
	begin(resummed), end(resummed)
	);
	}


	void train(
	HEJ::Unweighter & unweighter,
	HEJ::BufferedEventReader & reader,
	HEJ::EventReweighter & reweighter,
	const int total_trials,
	const double max_dev,
	double reweight_factor,
	HEJ::JetParameters const & fixed_order_jets
	) {
	std::cout << "Reading up to " << total_trials << " training events...\n";
	auto FO_events = peek_events(reader, total_trials);
	if(FO_events.empty()) {
	throw std::runtime_error{
	"No events generated to calibrate the unweighting weight!"
	"Please increase the number \"trials\" or deactivate the unweighting."
	};
	}
	const int trials = total_trials/FO_events.size();
	// adjust reweight factor so that the overall normalisation
	// is the same as in the full run
	reweight_factor *= trials;
	for(auto & hepeup: FO_events) {
	hepeup.XWGTUP *= reweight_factor;
	}
	std::cout << "Training unweighter with "
	<< trials << '*' << FO_events.size() << " events\n";

	auto progress = HEJ::ProgressBar<int>{
	std::cout, static_cast<int>(FO_events.size())
	};
	std::vector<HEJ::Event> resummation_events;
	for(auto const & hepeup: FO_events) {
	append_resummed_events(
	resummation_events,
	reweighter, hepeup, trials, fixed_order_jets
	);
	++progress;
	}

	unweighter.set_cut_to_peakwt(resummation_events, max_dev);
	std::cout << "\nUnweighting events with weight up to "
	<< unweighter.get_cut() << '\n';
	}

	int main(int argn, char** argv) {
	using clock = std::chrono::system_clock;

	if (argn != 3) {
	std::cerr << "\n# Usage:\n."<< argv[0] <<" config_file input_file\n\n";
	return EXIT_FAILURE;
	}

	const auto start_time = clock::now();
	{
	std::cout << "Starting " << HEJ::Version::package_name_full()
	<< ", revision " << HEJ::Version::revision() << " ("
	<< time_to_string(clock::to_time_t(start_time)) << ")" << std::endl;
	}
	fastjet::ClusterSequence::print_banner();

	// read configuration
	const HEJ::Config config = load_config(argv[1]);
	auto reader = HEJ::make_reader(argv[2]);
	assert(reader);

	auto heprup{ reader->heprup() };
	heprup.generators.emplace_back(LHEF::XMLTag{});
	heprup.generators.back().name = HEJ::Version::package_name();
	heprup.generators.back().version = HEJ::Version::String();

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

	HEJ::CombinedEventWriter writer{config.output, std::move(heprup)};

	double global_reweight = 1.;
	const auto & max_events = config.max_events;
	// if we need the event number:
	if(std::abs(heprup.IDWTUP) == 4 \|\| std::abs(heprup.IDWTUP) == 1 \|\| max_events){
	// try to read from LHE head
	auto input_events{reader->number_events()};
	if(!input_events) {
	// else count manually
	auto t_reader = HEJ::make_reader(argv[2]);
	input_events = 0;
	while(t_reader->read_event()) ++(*input_events);
	}
	if(std::abs(heprup.IDWTUP) == 4 \|\| std::abs(heprup.IDWTUP) == 1){
	// IDWTUP 4 or 1 assume average(weight)=xs, but we need sum(weights)=xs
	std::cout << "Found IDWTUP " << heprup.IDWTUP << ": "
	<< "assuming \"cross section = average weight\".\n"
	<< "converting to \"cross section = sum of weights\" ";
	global_reweight /= *input_events;
	}
	if(max_events && (input_events > max_events)){
	// maximal number of events given
	global_reweight = input_events/static_cast<double>(*max_events);
	std::cout << "Processing " << *max_events
	<< " out of " << *input_events << " events\n";
	}
	}

	HEJ::ScaleGenerator scale_gen{
	config.scales.base,
	config.scales.factors,
	config.scales.max_ratio
	};
	- auto ran = HEJ::make_RNG(config.rng.name, config.rng.seed);
	+ std::shared_ptr<HEJ::RNG> ran{
	+ HEJ::make_RNG(config.rng.name, config.rng.seed)};
	assert(ran != nullptr);
	HEJ::EventReweighter hej{
	reader->heprup(),
	std::move(scale_gen),
	to_EventReweighterConfig(config),
	*ran
	};

	HEJ::optional<HEJ::Unweighter> unweighter{};
	if(config.weight_type != HEJ::WeightType::weighted) {
	unweighter = HEJ::Unweighter{};
	}
	if(config.weight_type == HEJ::WeightType::partially_unweighted) {
	HEJ::BufferedEventReader buffered_reader{std::move(reader)};
	assert(config.unweight_config);
	train(
	*unweighter,
	buffered_reader,
	hej,
	config.unweight_config->trials,
	config.unweight_config->max_dev,
	global_reweight/config.trials,
	config.fixed_order_jets
	);
	reader = std::make_unique<HEJ::BufferedEventReader>(
	std::move(buffered_reader)
	);
	}

	// status infos & eye candy
	size_t nevent = 0;
	std::array<int, HEJ::event_type::last_type + 1>
	nevent_type{0}, nfailed_type{0};
	auto progress = make_progress_bar(reader->heprup().XSECUP);
	HEJ::CrossSectionAccumulator xs;
	std::map<HEJ::StatusCode, int> status_counter;
	size_t total_trials = 0;
	size_t total_resum = 0;

	// Loop over the events in the input file
	while(reader->read_event() && (!max_events \|\| nevent < *max_events) ){
	++nevent;

	// reweight events so that the total cross section is conserved
	auto hepeup = reader->hepeup();
	hepeup.XWGTUP *= global_reweight;

	const auto FO_event = to_event(hepeup, config.fixed_order_jets);
	if(FO_event.central().weight == 0) {
	static const bool warned_once = [argv,nevent](){
	std::cerr
	<< "WARNING: event number " << nevent
	<< " in " << argv[2] << " has zero weight. "
	"Ignoring this and all further events with vanishing weight.\n";
	return true;
	}();
	(void) warned_once; // shut up compiler warnings
	continue;
	}

	auto resummed_events{ hej.reweight(FO_event, config.trials) };

	// some bookkeeping
	for(auto const & s: hej.status())
	++status_counter[s];
	total_trials+=hej.status().size();
	++nevent_type[FO_event.type()];

	if(resummed_events.empty()) ++nfailed_type[FO_event.type()];

	if(unweighter) {
	unweight(unweighter, config.weight_type, resummed_events, ran);
	}

	// analysis
	for(auto & ev: resummed_events){
	//TODO: move pass_cuts to after phase space point generation
	if(analysis->pass_cuts(ev, FO_event)){
	analysis->fill(ev, FO_event);
	writer.write(ev);
	} else {
	ev.parameters()*=0; // do not use discarded events afterwards
	}
	}
	xs.fill_correlated(resummed_events);
	total_resum += resummed_events.size();
	if(progress) progress->increment(FO_event.central().weight);
	} // main event loop
	std::cout << '\n';
	analysis->finalise();

	using namespace HEJ::event_type;
	std::cout<< "Events processed: " << nevent << " (" << total_resum << " resummed)"<< '\n';
	std::cout << '\t' << name(EventType::first_type) << ": "
	<< nevent_type[EventType::first_type]
	<< ", failed to reconstruct " << nfailed_type[EventType::first_type]
	<< '\n';
	for(auto i=EventType::first_type+1; i<=EventType::last_type; i*=2){
	std::cout << '\t' << name(static_cast<EventType>(i)) << ": "
	<< nevent_type[i]
	<< ", failed to reconstruct " << nfailed_type[i]
	<< '\n';
	}

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

	std::cout << "Generation statistic: "
	<< status_counter[HEJ::StatusCode::good] << "/" << total_trials
	<< " trials successful.\n";
	for(auto && entry: status_counter){
	const double fraction = static_cast<double>(entry.second)/total_trials;
	const int percent = std::round(100*fraction);
	std::cout << std::left << std::setw(17) << (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 << "] " <<std::setw(2)<<std::right<< percent << "%\n";
	}

	std::chrono::duration<double> run_time = (clock::now() - start_time);
	std::cout << "\nFinished " << HEJ::Version::package_name() << " at "
	<< time_to_string(clock::to_time_t(clock::now()))
	<< "\n=> Runtime: " << run_time.count() << " sec ("
	<< nevent/run_time.count() << " Events/sec).\n";

	return EXIT_SUCCESS;
	}
	diff --git a/t/test_scale_arithmetics.cc b/t/test_scale_arithmetics.cc
	index 3d6dcfa..2a0cb6a 100644
	--- a/t/test_scale_arithmetics.cc
	+++ b/t/test_scale_arithmetics.cc
	@@ -1,94 +1,95 @@
	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include <fstream>
	#include <algorithm>

	#include "LHEF/LHEF.h"

	#include "HEJ/EventReweighter.hh"
	#include "HEJ/make_RNG.hh"
	#include "HEJ/Event.hh"
	#include "HEJ/YAMLreader.hh"
	#include "HEJ/stream.hh"

	#include "hej_test.hh"

	constexpr double ep = 1e-13;

	void dump(HEJ::Event const & ev){
	{
	LHEF::Writer writer{std::cout};
	std::cout << std::setprecision(6);
	writer.hepeup = to_HEPEUP(std::move(ev), nullptr);
	writer.writeEvent();
	}
	std::cout << "Rapidity ordering:\n";
	for(const auto & part: ev.outgoing()){
	std::cout << std::setw(2) << part.type << ": "<< std::setw(7) << part.rapidity() << std::endl;
	}
	}

	int main(int argn, char** argv){
	if(argn != 3){
	std::cerr << "\n# Usage:\n."<< argv[0] <<" config.yml input_file.lhe\n\n";
	return EXIT_FAILURE;
	}
	HEJ::Config config = HEJ::load_config(argv[1]);
	config.scales = HEJ::to_ScaleConfig(
	YAML::Load("scales: [H_T, 1 * H_T, 2/2 * H_T, 2H_T/2, H_T/22, H_T/2/24, H_TH_T/H_T]")
	);

	HEJ::istream in{argv[2]};
	LHEF::Reader reader{in};

	- auto ran = HEJ::make_RNG(config.rng.name, config.rng.seed);
	+ std::shared_ptr<HEJ::RNG> ran{
	+ HEJ::make_RNG(config.rng.name, config.rng.seed)};

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

	HEJ::EventReweighter resum{
	reader.heprup,
	std::move(scale_gen),
	to_EventReweighterConfig(config),
	*ran
	};

	size_t i = 0;
	while(reader.readEvent()){
	++i;

	HEJ::Event::EventData data{reader.hepeup};
	shuffle_particles(data);

	HEJ::Event event{
	data.cluster(
	config.resummation_jets.def,
	config.resummation_jets.min_pt
	)
	};

	auto resummed = resum.reweight(event, config.trials);
	for(auto && ev: resummed) {
	for(auto &&var: ev.variations()) {
	if(std::abs(var.muf - ev.central().muf) > ep) {
	std::cerr
	<< std::setprecision(15)
	<< "unequal scales: " << var.muf
	<< " != " << ev.central().muf << '\n'
	<< "in resummed event:\n";
	dump(ev);
	std::cerr << "\noriginal event:\n";
	dump(event);
	return EXIT_FAILURE;
	}
	}
	}
	}
	return EXIT_SUCCESS;
	}

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