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	diff --git a/DipoleShower/Base/DipoleEventReweight.h b/DipoleShower/Base/DipoleEventReweight.h
	--- a/DipoleShower/Base/DipoleEventReweight.h
	+++ b/DipoleShower/Base/DipoleEventReweight.h
	@@ -1,99 +1,107 @@
	// -- C++ --
	//
	// DipoleEventReweight.h is a part of Herwig - A multi-purpose Monte Carlo event generator
	// Copyright (C) 2002-2007 The Herwig Collaboration
	//
	// Herwig is licenced under version 2 of the GPL, see COPYING for details.
	// Please respect the MCnet academic guidelines, see GUIDELINES for details.
	//
	#ifndef Herwig_DipoleEventReweight_H
	#define Herwig_DipoleEventReweight_H
	//
	// This is the declaration of the DipoleEventReweight class.
	//

	#include "ThePEG/Handlers/HandlerBase.h"
	#include "ThePEG/StandardModel/AlphaSBase.h"


	namespace Herwig {

	using namespace ThePEG;

	/**
	* \ingroup DipoleShower
	* \author Simon Platzer
	* \brief Reweight full final states produced by the shower
	*
	* @see \ref DipoleEventReweightInterfaces "The interfaces"
	* defined for DipoleEventReweight.
	*/
	class DipoleEventReweight: public HandlerBase {

	public:

	/** @name Standard constructors and destructors. */
	//@{
	/**
	* The default constructor.
	*/
	DipoleEventReweight();

	/**
	* The destructor.
	*/
	virtual ~DipoleEventReweight();
	//@}

	public:

	/**
	* Return the weight for the given incoming, outgoing coloured and
	* hard colour neutral particles
	*/
	- virtual double weight(const PPair& in, const PList& out, const PList& hard, Ptr<AlphaSBase>::tptr as) const = 0;
	+ virtual double weight(const PPair& in, const PList& out, const PList& hard,
	+ Ptr<AlphaSBase>::tptr as) const = 0;
	+
	+ /**
	+ * Return the weight for the given incoming, outgoing coloured and
	+ * hard colour neutral particles
	+ */
	+ virtual double weightNoEmission(const PPair& in, const PList& out, const PList& hard,
	+ Ptr<AlphaSBase>::tptr as) const = 0;

	public:

	/** @name Functions used by the persistent I/O system. */
	//@{
	/**
	* Function used to write out object persistently.
	* @param os the persistent output stream written to.
	*/
	void persistentOutput(PersistentOStream & os) const;

	/**
	* Function used to read in object persistently.
	* @param is the persistent input stream read from.
	* @param version the version number of the object when written.
	*/
	void persistentInput(PersistentIStream & is, int version);
	//@}

	/**
	* The standard Init function used to initialize the interfaces.
	* Called exactly once for each class by the class description system
	* before the main function starts or
	* when this class is dynamically loaded.
	*/
	static void Init();


	// If needed, insert declarations of virtual function defined in the
	// InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).


	private:

	/**
	* The assignment operator is private and must never be called.
	* In fact, it should not even be implemented.
	*/
	DipoleEventReweight & operator=(const DipoleEventReweight &);

	};

	}

	#endif /* Herwig_DipoleEventReweight_H */
	diff --git a/DipoleShower/DipoleShowerHandler.cc b/DipoleShower/DipoleShowerHandler.cc
	--- a/DipoleShower/DipoleShowerHandler.cc
	+++ b/DipoleShower/DipoleShowerHandler.cc
	@@ -1,1095 +1,1104 @@
	// -- C++ --
	//
	// DipoleShowerHandler.cc is a part of Herwig - A multi-purpose Monte Carlo event generator
	// Copyright (C) 2002-2007 The Herwig Collaboration
	//
	// Herwig is licenced under version 2 of the GPL, see COPYING for details.
	// Please respect the MCnet academic guidelines, see GUIDELINES for details.
	//
	//
	// This is the implementation of the non-inlined, non-templated member
	// functions of the DipoleShowerHandler class.
	//

	#include <config.h>
	#include "DipoleShowerHandler.h"
	#include "ThePEG/Interface/ClassDocumentation.h"
	#include "ThePEG/Interface/Reference.h"
	#include "ThePEG/Interface/RefVector.h"
	#include "ThePEG/Interface/Parameter.h"
	#include "ThePEG/Interface/Switch.h"

	#include "ThePEG/Persistency/PersistentOStream.h"
	#include "ThePEG/Persistency/PersistentIStream.h"

	// include theses to have complete types
	#include "Herwig/Shower/Base/Evolver.h"
	#include "Herwig/Shower/Base/ShowerParticle.h"
	#include "Herwig/PDF/MPIPDF.h"
	#include "Herwig/PDF/MinBiasPDF.h"
	#include "Herwig/Shower/Base/ShowerTree.h"
	#include "Herwig/Shower/Base/KinematicsReconstructor.h"
	#include "Herwig/Shower/Base/PartnerFinder.h"
	#include "Herwig/PDF/HwRemDecayer.h"

	#include "Herwig/DipoleShower/Utility/DipolePartonSplitter.h"

	#include "Herwig/MatrixElement/Matchbox/Base/SubtractedME.h"
	#include "Herwig/MatrixElement/Matchbox/MatchboxFactory.h"

	using namespace Herwig;

	bool DipoleShowerHandler::firstWarn = true;

	DipoleShowerHandler::DipoleShowerHandler()
	: ShowerHandler(), chainOrderVetoScales(true),
	nEmissions(0), discardNoEmissions(false), firstMCatNLOEmission(false),
	doFSR(true), doISR(true), realignmentScheme(0),
	verbosity(0), printEvent(0), nTries(0),
	didRadiate(false), didRealign(false),
	theRenormalizationScaleFreeze(1.*GeV),
	theFactorizationScaleFreeze(2.*GeV),
	isMCatNLOSEvent(false),
	isMCatNLOHEvent(false), theDoCompensate(false),
	theFreezeGrid(500000), maxPt(ZERO) {}

	DipoleShowerHandler::~DipoleShowerHandler() {}

	IBPtr DipoleShowerHandler::clone() const {
	return new_ptr(*this);
	}

	IBPtr DipoleShowerHandler::fullclone() const {
	return new_ptr(*this);
	}

	tPPair DipoleShowerHandler::cascade(tSubProPtr sub, XCPtr,
	Energy optHardPt, Energy optCutoff) {

	useMe();

	prepareCascade(sub);

	if ( !doFSR && ! doISR )
	return sub->incoming();

	eventRecord().clear();
	eventRecord().prepare(sub,dynamic_ptr_cast<tStdXCombPtr>(lastXCombPtr()),pdfs());

	if ( eventRecord().outgoing().empty() && !doISR )
	return sub->incoming();
	if ( !eventRecord().incoming().first->coloured() &&
	!eventRecord().incoming().second->coloured() &&
	!doFSR )
	return sub->incoming();

	nTries = 0;

	while ( true ) {

	try {

	didRadiate = false;
	didRealign = false;

	isMCatNLOSEvent = false;
	isMCatNLOHEvent = false;

	if ( eventRecord().xcombPtr() ) {

	Ptr<SubtractedME>::tptr subme =
	dynamic_ptr_cast<Ptr<SubtractedME>::tptr>(eventRecord().xcombPtr()->matrixElement());
	Ptr<MatchboxMEBase>::tptr me =
	dynamic_ptr_cast<Ptr<MatchboxMEBase>::tptr>(eventRecord().xcombPtr()->matrixElement());
	Ptr<SubtractionDipole>::tptr dipme =
	dynamic_ptr_cast<Ptr<SubtractionDipole>::tptr>(eventRecord().xcombPtr()->matrixElement());


	if ( subme ) {
	if ( subme->showerApproximation() ) {
	// don't do this for POWHEG-type corrections
	if ( !subme->showerApproximation()->needsSplittingGenerator() ) {
	theShowerApproximation = subme->showerApproximation();
	if ( subme->realShowerSubtraction() )
	isMCatNLOHEvent = true;
	else if ( subme->virtualShowerSubtraction() )
	isMCatNLOSEvent = true;
	}
	}
	} else if ( me ) {
	if ( me->factory()->showerApproximation() ) {
	if ( !me->factory()->showerApproximation()->needsSplittingGenerator() ) {
	theShowerApproximation = me->factory()->showerApproximation();
	isMCatNLOSEvent = true;
	}
	}
	}

	string error = "Inconsistent hard emission set-up in DipoleShowerHandler::cascade. ";
	if (evolver()->hardEmissionMode()==1 \|\| evolver()->hardEmissionMode()==3 )
	throw Exception() << error
	<< "Cannot generate POWHEG corrections "
	<< "for particle decays using DipoleShowerHandler. "
	<< "Check value of Evolver:HardEmissionMode."
	<< Exception::runerror;
	if ( ( isMCatNLOSEvent \|\| isMCatNLOHEvent ) && evolver()->hardEmissionMode()==2)
	throw Exception() << error
	<< "Cannot generate POWHEG matching with MC@NLO shower approximation. "
	<< "Add 'set Evolver:HardEmissionMode 0' to input file."
	<< Exception::runerror;
	if (me && me->factory()->showerApproximation()){
	if(me->factory()->showerApproximation()->needsTruncatedShower())
	throw Exception() << error
	<< "No truncated shower needed with DipoleShowerHandler. Add "
	<< "'set MEMatching:TruncatedShower No' to input file."
	<< Exception::runerror;
	if (!( isMCatNLOSEvent \|\| isMCatNLOHEvent ) &&
	evolver()->hardEmissionMode()==0 && firstWarn){
	firstWarn=false;
	throw Exception() << error
	<< "Evolver:HardEmissionMode will be set to 'MatchboxPOWHEG'"
	<< Exception::warning;
	}
	}
	else if (subme && subme->factory()->showerApproximation()){
	if(subme->factory()->showerApproximation()->needsTruncatedShower())
	throw Exception() << error
	<< "No truncated shower needed with DipoleShowerHandler. Add "
	<< "'set MEMatching:TruncatedShower No' to input file."
	<< Exception::runerror;
	if (!( isMCatNLOSEvent \|\| isMCatNLOHEvent ) &&
	evolver()->hardEmissionMode()==0 && firstWarn){
	firstWarn=false;
	throw Exception() << error
	<< "Evolver:HardEmissionMode will be set to 'MatchboxPOWHEG'"
	<< Exception::warning;
	}
	}
	else if (dipme && evolver()->hardEmissionMode() == 0 && firstWarn){
	firstWarn=false;
	throw Exception() << error
	<< "Evolver:HardEmissionMode will be set to 'MatchboxPOWHEG'"
	<< Exception::warning;
	}
	else if (!dipme && evolver()->hardEmissionMode()==2 &&
	ShowerHandler::currentHandler()->firstInteraction())
	throw Exception() << error
	<< "POWHEG matching requested for LO events. Include "
	<< "'set Factory:ShowerApproximation MEMatching' in input file."
	<< Exception::runerror;

	}

	hardScales(lastXCombPtr()->lastCentralScale());

	if ( verbosity > 1 ) {
	generator()->log() << "DipoleShowerHandler starting off:\n";
	eventRecord().debugLastEvent(generator()->log());
	generator()->log() << flush;
	}

	unsigned int nEmitted = 0;

	if ( firstMCatNLOEmission ) {

	if ( !isMCatNLOHEvent )
	nEmissions = 1;
	else
	nEmissions = 0;

	}

	if ( !firstMCatNLOEmission ) {

	doCascade(nEmitted,optHardPt,optCutoff);

	if ( discardNoEmissions ) {
	if ( !didRadiate )
	throw Veto();
	if ( nEmissions )
	if ( nEmissions < nEmitted )
	throw Veto();
	}

	} else {

	if ( nEmissions == 1 )
	doCascade(nEmitted,optHardPt,optCutoff);

	}

	if ( intrinsicPtGenerator ) {
	if ( eventRecord().incoming().first->coloured() &&
	eventRecord().incoming().second->coloured() ) {
	SpinOneLorentzRotation rot =
	intrinsicPtGenerator->kick(eventRecord().incoming(),
	eventRecord().intermediates());
	eventRecord().transform(rot);
	}
	}

	didRealign = realign();

	constituentReshuffle();

	break;

	} catch (RedoShower&) {

	if ( ++nTries > maxtry() )
	throw ShowerTriesVeto(maxtry());

	eventRecord().clear();
	eventRecord().prepare(sub,dynamic_ptr_cast<tStdXCombPtr>(lastXCombPtr()),pdfs());

	continue;

	} catch (...) {
	throw;
	}

	}

	return eventRecord().fillEventRecord(newStep(),firstInteraction(),didRealign);

	}

	void DipoleShowerHandler::constituentReshuffle() {

	if ( constituentReshuffler ) {
	constituentReshuffler->reshuffle(eventRecord().outgoing(),
	eventRecord().incoming(),
	eventRecord().intermediates());
	}

	}

	void DipoleShowerHandler::hardScales(Energy2 muf) {

	maxPt = generator()->maximumCMEnergy();

	if ( restrictPhasespace() ) {
	if ( !hardScaleIsMuF() \|\| !firstInteraction() ) {
	if ( !eventRecord().outgoing().empty() ) {
	for ( PList::const_iterator p = eventRecord().outgoing().begin();
	p != eventRecord().outgoing().end(); ++p )
	maxPt = min(maxPt,(**p).momentum().mt());
	} else {
	assert(!eventRecord().hard().empty());
	Lorentz5Momentum phard(ZERO,ZERO,ZERO,ZERO);
	for ( PList::const_iterator p = eventRecord().hard().begin();
	p != eventRecord().hard().end(); ++p )
	phard += (**p).momentum();
	Energy mhard = phard.m();
	maxPt = mhard;
	}
	maxPt *= hardScaleFactor();
	} else {
	maxPt = hardScaleFactor()*sqrt(muf);
	}
	}

	for ( list<DipoleChain>::iterator ch = eventRecord().chains().begin();
	ch != eventRecord().chains().end(); ++ch ) {

	Energy minVetoScale = -1.*GeV;

	for ( list<Dipole>::iterator dip = ch->dipoles().begin();
	dip != ch->dipoles().end(); ++dip ) {

	// max scale per config
	Energy maxFirst = 0.0*GeV;
	Energy maxSecond = 0.0*GeV;

	for ( vector<Ptr<DipoleSplittingKernel>::ptr>::iterator k =
	kernels.begin(); k != kernels.end(); ++k ) {

	pair<bool,bool> conf = make_pair(true,false);

	if ( (**k).canHandle(dip->index(conf)) ) {
	Energy scale =
	evolutionOrdering()->hardScale(dip->emitter(conf),dip->spectator(conf),
	dip->emitterX(conf),dip->spectatorX(conf),
	**k,dip->index(conf));
	maxFirst = max(maxFirst,scale);
	}

	conf = make_pair(false,true);

	if ( (**k).canHandle(dip->index(conf)) ) {
	Energy scale =
	evolutionOrdering()->hardScale(dip->emitter(conf),dip->spectator(conf),
	dip->emitterX(conf),dip->spectatorX(conf),
	**k,dip->index(conf));
	maxSecond = max(maxSecond,scale);
	}

	}

	if ( dip->leftParticle()->vetoScale() >= ZERO ) {
	maxFirst = min(maxFirst,sqrt(dip->leftParticle()->vetoScale()));
	if ( minVetoScale >= ZERO )
	minVetoScale = min(minVetoScale,sqrt(dip->leftParticle()->vetoScale()));
	else
	minVetoScale = sqrt(dip->leftParticle()->vetoScale());
	}

	if ( dip->rightParticle()->vetoScale() >= ZERO ) {
	maxSecond = min(maxSecond,sqrt(dip->rightParticle()->vetoScale()));
	if ( minVetoScale >= ZERO )
	minVetoScale = min(minVetoScale,sqrt(dip->rightParticle()->vetoScale()));
	else
	minVetoScale = sqrt(dip->rightParticle()->vetoScale());
	}

	maxFirst = min(maxPt,maxFirst);
	dip->emitterScale(make_pair(true,false),maxFirst);

	maxSecond = min(maxPt,maxSecond);
	dip->emitterScale(make_pair(false,true),maxSecond);

	}

	if ( !evolutionOrdering()->independentDipoles() &&
	chainOrderVetoScales &&
	minVetoScale >= ZERO ) {
	for ( list<Dipole>::iterator dip = ch->dipoles().begin();
	dip != ch->dipoles().end(); ++dip ) {
	dip->leftScale(min(dip->leftScale(),minVetoScale));
	dip->rightScale(min(dip->rightScale(),minVetoScale));
	}
	}

	}

	}

	Energy DipoleShowerHandler::getWinner(DipoleSplittingInfo& winner,
	const Dipole& dip,
	pair<bool,bool> conf,
	Energy optHardPt,
	Energy optCutoff) {
	return
	getWinner(winner,dip.index(conf),
	dip.emitterX(conf),dip.spectatorX(conf),
	conf,dip.emitter(conf),dip.spectator(conf),
	dip.emitterScale(conf),optHardPt,optCutoff);
	}

	Energy DipoleShowerHandler::getWinner(SubleadingSplittingInfo& winner,
	Energy optHardPt,
	Energy optCutoff) {
	return
	getWinner(winner,winner.index(),
	winner.emitterX(),winner.spectatorX(),
	winner.configuration(),
	winner.emitter(),winner.spectator(),
	winner.startScale(),optHardPt,optCutoff);
	}

	Energy DipoleShowerHandler::getWinner(DipoleSplittingInfo& winner,
	const DipoleIndex& index,
	double emitterX, double spectatorX,
	pair<bool,bool> conf,
	tPPtr emitter, tPPtr spectator,
	Energy startScale,
	Energy optHardPt,
	Energy optCutoff) {

	if ( !index.initialStateEmitter() &&
	!doFSR ) {
	winner.didStopEvolving();
	return 0.0*GeV;
	}

	if ( index.initialStateEmitter() &&
	!doISR ) {
	winner.didStopEvolving();
	return 0.0*GeV;
	}

	DipoleSplittingInfo candidate;
	candidate.index(index);
	candidate.configuration(conf);
	candidate.emitterX(emitterX);
	candidate.spectatorX(spectatorX);

	if ( generators().find(candidate.index()) == generators().end() )
	getGenerators(candidate.index());

	//
	// NOTE -- needs proper fixing at some point
	//
	// For some very strange reason, equal_range gives back
	// key ranges it hasn't been asked for. This particularly
	// happens e.g. for FI dipoles of the same kind, but different
	// PDF (hard vs MPI PDF). I can't see a reason for this,
	// as DipoleIndex properly implements comparison for equality
	// and (lexicographic) ordering; for the time being, we
	// use equal_range, extented by an explicit check for wether
	// the key is indeed what we wanted. See line after (*) comment
	// below.
	//

	pair<GeneratorMap::iterator,GeneratorMap::iterator> gens
	= generators().equal_range(candidate.index());

	Energy winnerScale = 0.0*GeV;
	GeneratorMap::iterator winnerGen = generators().end();

	for ( GeneratorMap::iterator gen = gens.first; gen != gens.second; ++gen ) {

	// (*) see NOTE above
	if ( !(gen->first == candidate.index()) )
	continue;

	if ( startScale <= gen->second->splittingKinematics()->IRCutoff() )
	continue;

	Energy dScale =
	gen->second->splittingKinematics()->dipoleScale(emitter->momentum(),
	spectator->momentum());

	// in very exceptional cases happening in DIS
	if ( isnan(dScale/GeV ) )
	throw RedoShower();

	candidate.scale(dScale);
	candidate.continuesEvolving();
	Energy hardScale = evolutionOrdering()->maxPt(startScale,candidate,*(gen->second->splittingKernel()));

	Energy maxPossible =
	gen->second->splittingKinematics()->ptMax(candidate.scale(),
	candidate.emitterX(), candidate.spectatorX(),
	candidate.index(),
	*gen->second->splittingKernel());

	Energy ircutoff =
	optCutoff < gen->second->splittingKinematics()->IRCutoff() ?
	gen->second->splittingKinematics()->IRCutoff() :
	optCutoff;

	if ( maxPossible <= ircutoff ) {
	continue;
	}

	if ( maxPossible >= hardScale )
	candidate.hardPt(hardScale);
	else {
	hardScale = maxPossible;
	candidate.hardPt(maxPossible);
	}

	gen->second->generate(candidate,optHardPt,optCutoff);
	Energy nextScale = evolutionOrdering()->evolutionScale(gen->second->lastSplitting(),*(gen->second->splittingKernel()));

	if ( firstInteraction() && profileScales() && nextScale > ircutoff ) {
	while ( UseRandom::rnd() > profileScales()->hardScaleProfile(maxPt,nextScale) ) {
	candidate.continuesEvolving();
	Energy nextHardScale = evolutionOrdering()->maxPt(nextScale,candidate,*(gen->second->splittingKernel()));
	candidate.hardPt(nextHardScale);
	gen->second->generate(candidate,optHardPt,optCutoff);
	nextScale = evolutionOrdering()->evolutionScale(gen->second->lastSplitting(),*(gen->second->splittingKernel()));
	if ( nextScale <= ircutoff \|\| candidate.stoppedEvolving() )
	break;
	}
	}

	if ( nextScale > winnerScale ) {
	winner.fill(candidate);
	gen->second->completeSplitting(winner);
	winnerGen = gen;
	winnerScale = nextScale;
	}

	}

	if ( winnerGen == generators().end() ) {
	winner.didStopEvolving();
	return 0.0*GeV;
	}

	if ( winner.stoppedEvolving() )
	return 0.0*GeV;

	return winnerScale;

	}

	void DipoleShowerHandler::doCascade(unsigned int& emDone,
	Energy optHardPt,
	Energy optCutoff) {

	if ( nEmissions )
	if ( emDone == nEmissions )
	return;

	DipoleSplittingInfo winner;
	DipoleSplittingInfo dipoleWinner;

	while ( eventRecord().haveChain() ) {

	if ( verbosity > 2 ) {
	generator()->log() << "DipoleShowerHandler selecting splittings for the chain:\n"
	<< eventRecord().currentChain() << flush;
	}

	list<Dipole>::iterator winnerDip = eventRecord().currentChain().dipoles().end();

	Energy winnerScale = 0.0*GeV;
	Energy nextLeftScale = 0.0*GeV;
	Energy nextRightScale = 0.0*GeV;

	for ( list<Dipole>::iterator dip = eventRecord().currentChain().dipoles().begin();
	dip != eventRecord().currentChain().dipoles().end(); ++dip ) {

	nextLeftScale = getWinner(dipoleWinner,*dip,make_pair(true,false),optHardPt,optCutoff);

	if ( nextLeftScale > winnerScale ) {
	winnerScale = nextLeftScale;
	winner = dipoleWinner;
	winnerDip = dip;
	}

	nextRightScale = getWinner(dipoleWinner,*dip,make_pair(false,true),optHardPt,optCutoff);

	if ( nextRightScale > winnerScale ) {
	winnerScale = nextRightScale;
	winner = dipoleWinner;
	winnerDip = dip;
	}

	if ( evolutionOrdering()->independentDipoles() ) {
	Energy dipScale = max(nextLeftScale,nextRightScale);
	if ( dip->leftScale() > dipScale )
	dip->leftScale(dipScale);
	if ( dip->rightScale() > dipScale )
	dip->rightScale(dipScale);
	}

	}

	if ( verbosity > 1 ) {
	if ( winnerDip != eventRecord().currentChain().dipoles().end() )
	generator()->log() << "DipoleShowerHandler selected the splitting:\n"
	<< winner << " for the dipole\n"
	<< (*winnerDip) << flush;
	else
	generator()->log() << "DipoleShowerHandler could not select a splitting above the IR cutoff\n"
	<< flush;
	}

	// pop the chain if no dipole did radiate
	if ( winnerDip == eventRecord().currentChain().dipoles().end() ) {
	+ if ( theEventReweight ) {
	+ double w = theEventReweight->weightNoEmission(eventRecord().incoming(),
	+ eventRecord().outgoing(),
	+ eventRecord().hard(),theGlobalAlphaS);
	+ Ptr<StandardEventHandler>::tptr eh =
	+ dynamic_ptr_cast<Ptr<StandardEventHandler>::tptr>(eventHandler());
	+ assert(eh);
	+ eh->reweight(w);
	+ }
	eventRecord().popChain();
	continue;
	}

	// otherwise perform the splitting

	didRadiate = true;

	isMCatNLOSEvent = false;
	isMCatNLOHEvent = false;

	pair<list<Dipole>::iterator,list<Dipole>::iterator> children;

	DipoleChain* firstChain = 0;
	DipoleChain* secondChain = 0;

	eventRecord().split(winnerDip,winner,children,firstChain,secondChain);

	assert(firstChain && secondChain);

	evolutionOrdering()->setEvolutionScale(winnerScale,winner,*firstChain,children);

	if ( !secondChain->dipoles().empty() )
	evolutionOrdering()->setEvolutionScale(winnerScale,winner,*secondChain,children);

	if ( verbosity > 1 ) {
	generator()->log() << "DipoleShowerHandler did split the last selected dipole into:\n"
	<< (children.first) << (children.second) << flush;
	}

	if ( verbosity > 2 ) {
	generator()->log() << "After splitting the last selected dipole, "
	<< "DipoleShowerHandler encountered the following chains:\n"
	<< (firstChain) << (secondChain) << flush;
	}

	if ( theEventReweight ) {
	double w = theEventReweight->weight(eventRecord().incoming(),
	eventRecord().outgoing(),
	eventRecord().hard(),theGlobalAlphaS);
	Ptr<StandardEventHandler>::tptr eh =
	dynamic_ptr_cast<Ptr<StandardEventHandler>::tptr>(eventHandler());
	assert(eh);
	eh->reweight(w);
	}

	if ( nEmissions )
	if ( ++emDone == nEmissions )
	return;

	}

	}

	bool DipoleShowerHandler::realign() {

	if ( !didRadiate && !intrinsicPtGenerator )
	return false;

	if ( eventRecord().incoming().first->coloured() \|\|
	eventRecord().incoming().second->coloured() ) {

	if ( eventRecord().incoming().first->momentum().perp2()/GeV2 < 1e-10 &&
	eventRecord().incoming().second->momentum().perp2()/GeV2 < 1e-10 )
	return false;

	pair<Lorentz5Momentum,Lorentz5Momentum> inMomenta
	(eventRecord().incoming().first->momentum(),
	eventRecord().incoming().second->momentum());

	SpinOneLorentzRotation transform((inMomenta.first+inMomenta.second).findBoostToCM());

	Axis dir = (transform * inMomenta.first).vect().unit();
	Axis rot (-dir.y(),dir.x(),0);
	double theta = dir.theta();

	if ( lastParticles().first->momentum().z() < ZERO )
	theta = -theta;

	transform.rotate(-theta,rot);

	inMomenta.first = transform*inMomenta.first;
	inMomenta.second = transform*inMomenta.second;

	assert(inMomenta.first.z() > ZERO &&
	inMomenta.second.z() < ZERO);

	Energy2 sHat =
	(eventRecord().incoming().first->momentum() +
	eventRecord().incoming().second->momentum()).m2();

	pair<Energy,Energy> masses(eventRecord().incoming().first->mass(),
	eventRecord().incoming().second->mass());
	pair<Energy,Energy> qs;

	if ( !eventRecord().incoming().first->coloured() ) {
	assert(masses.second == ZERO);
	qs.first = eventRecord().incoming().first->momentum().z();
	qs.second = (sHat-sqr(masses.first))/(2.*(qs.first+sqrt(sqr(masses.first)+sqr(qs.first))));
	} else if ( !eventRecord().incoming().second->coloured() ) {
	assert(masses.first == ZERO);
	qs.second = eventRecord().incoming().second->momentum().z();
	qs.first = (sHat-sqr(masses.second))/(2.*(qs.second+sqrt(sqr(masses.second)+sqr(qs.second))));
	} else {
	assert(masses.first == ZERO && masses.second == ZERO);
	if ( realignmentScheme == 0 ) {
	double yX = eventRecord().pX().rapidity();
	double yInt = (transform*eventRecord().pX()).rapidity();
	double dy = yX-yInt;
	qs.first = (sqrt(sHat)/2.)*exp(dy);
	qs.second = (sqrt(sHat)/2.)*exp(-dy);
	} else if ( realignmentScheme == 1 ) {
	Energy sS = sqrt((lastParticles().first->momentum() +
	lastParticles().second->momentum()).m2());
	qs.first = eventRecord().fractions().first * sS / 2.;
	qs.second = eventRecord().fractions().second * sS / 2.;
	}
	}

	double beta =
	(qs.first-qs.second) /
	( sqrt(sqr(masses.first)+sqr(qs.first)) +
	sqrt(sqr(masses.second)+sqr(qs.second)) );
	transform.boostZ(beta);

	Lorentz5Momentum tmp;

	if ( eventRecord().incoming().first->coloured() ) {
	tmp = eventRecord().incoming().first->momentum();
	tmp = transform * tmp;
	eventRecord().incoming().first->set5Momentum(tmp);
	}
	if ( eventRecord().incoming().second->coloured() ) {
	tmp = eventRecord().incoming().second->momentum();
	tmp = transform * tmp;
	eventRecord().incoming().second->set5Momentum(tmp);
	}
	eventRecord().transform(transform);
	return true;

	}

	return false;

	}

	void DipoleShowerHandler::resetAlphaS(Ptr<AlphaSBase>::tptr as) {

	for ( vector<Ptr<DipoleSplittingKernel>::ptr>::iterator k = kernels.begin();
	k != kernels.end(); ++k ) {
	(**k).alphaS(as);
	(**k).renormalizationScaleFreeze(theRenormalizationScaleFreeze);
	(**k).factorizationScaleFreeze(theFactorizationScaleFreeze);
	}

	// clear the generators to be rebuild
	// actually, there shouldn't be any generators
	// when this happens.
	generators().clear();

	}

	void DipoleShowerHandler::resetReweight(Ptr<DipoleSplittingReweight>::tptr rw) {
	for ( GeneratorMap::iterator k = generators().begin();
	k != generators().end(); ++k )
	k->second->splittingReweight(rw);
	}

	void DipoleShowerHandler::getGenerators(const DipoleIndex& ind,
	Ptr<DipoleSplittingReweight>::tptr rw) {

	bool gotone = false;

	for ( vector<Ptr<DipoleSplittingKernel>::ptr>::iterator k =
	kernels.begin(); k != kernels.end(); ++k ) {
	if ( (**k).canHandle(ind) ) {

	if ( verbosity > 0 ) {
	generator()->log() << "DipoleShowerHandler encountered the dipole configuration\n"
	<< ind << " in event number "
	<< eventHandler()->currentEvent()->number()
	<< "\nwhich can be handled by the splitting kernel '"
	<< (**k).name() << "'.\n" << flush;
	}

	gotone = true;

	Ptr<DipoleSplittingGenerator>::ptr nGenerator =
	new_ptr(DipoleSplittingGenerator());
	nGenerator->doCompensate(theDoCompensate);
	nGenerator->splittingKernel(*k);
	nGenerator->splittingKernel()->renormalizationScaleFactor(renormalizationScaleFactor());
	nGenerator->splittingKernel()->factorizationScaleFactor(factorizationScaleFactor());
	nGenerator->splittingKernel()->freezeGrid(theFreezeGrid);

	GeneratorMap::const_iterator equivalent = generators().end();

	for ( GeneratorMap::const_iterator eq = generators().begin();
	eq != generators().end(); ++eq ) {
	if ( !eq->second->wrapping() )
	if ( (*k).canHandleEquivalent(ind,(eq->second->splittingKernel()),eq->first) ) {

	equivalent = eq;

	if ( verbosity > 0 ) {
	generator()->log() << "The dipole configuration "
	<< ind
	<< " can equivalently be handled by the existing\n"
	<< "generator for configuration "
	<< eq->first << " using the kernel '"
	<< eq->second->splittingKernel()->name()
	<< "'\n" << flush;
	}

	break;

	}
	}

	if ( equivalent != generators().end() ) {
	nGenerator->wrap(equivalent->second);
	}

	DipoleSplittingInfo dummy;
	dummy.index(ind);
	nGenerator->splittingReweight(rw);
	nGenerator->prepare(dummy);

	generators().insert(make_pair(ind,nGenerator));


	}
	}

	if ( !gotone ) {
	generator()->logWarning(Exception()
	<< "DipoleShowerHandler could not "
	<< "find a splitting kernel which is able "
	<< "to handle splittings off the dipole "
	<< ind << ".\n"
	<< "Please check the input files."
	<< Exception::warning);
	}

	}

	// If needed, insert default implementations of virtual function defined
	// in the InterfacedBase class here (using ThePEG-interfaced-impl in Emacs).

	void DipoleShowerHandler::doinit() {
	ShowerHandler::doinit();
	if ( theGlobalAlphaS )
	resetAlphaS(theGlobalAlphaS);
	}

	void DipoleShowerHandler::dofinish() {
	ShowerHandler::dofinish();
	}

	void DipoleShowerHandler::doinitrun() {
	ShowerHandler::doinitrun();
	}

	void DipoleShowerHandler::persistentOutput(PersistentOStream & os) const {
	os << kernels << theEvolutionOrdering
	<< constituentReshuffler << intrinsicPtGenerator
	<< theGlobalAlphaS << chainOrderVetoScales
	<< nEmissions << discardNoEmissions << firstMCatNLOEmission << doFSR << doISR
	<< realignmentScheme << verbosity << printEvent
	<< ounit(theRenormalizationScaleFreeze,GeV)
	<< ounit(theFactorizationScaleFreeze,GeV)
	<< isMCatNLOSEvent << isMCatNLOHEvent << theShowerApproximation
	<< theDoCompensate << theFreezeGrid
	<< theEventReweight << ounit(maxPt,GeV);
	}

	void DipoleShowerHandler::persistentInput(PersistentIStream & is, int) {
	is >> kernels >> theEvolutionOrdering
	>> constituentReshuffler >> intrinsicPtGenerator
	>> theGlobalAlphaS >> chainOrderVetoScales
	>> nEmissions >> discardNoEmissions >> firstMCatNLOEmission >> doFSR >> doISR
	>> realignmentScheme >> verbosity >> printEvent
	>> iunit(theRenormalizationScaleFreeze,GeV)
	>> iunit(theFactorizationScaleFreeze,GeV)
	>> isMCatNLOSEvent >> isMCatNLOHEvent >> theShowerApproximation
	>> theDoCompensate >> theFreezeGrid
	>> theEventReweight >> iunit(maxPt,GeV);
	}

	ClassDescription<DipoleShowerHandler> DipoleShowerHandler::initDipoleShowerHandler;
	// Definition of the static class description member.

	void DipoleShowerHandler::Init() {

	static ClassDocumentation<DipoleShowerHandler> documentation
	("The DipoleShowerHandler class manages the showering using "
	"the dipole shower algorithm.",
	"The shower evolution was performed using the algorithm described in "
	"\\cite{Platzer:2009jq} and \\cite{Platzer:2011bc}.",
	"%\\cite{Platzer:2009jq}\n"
	"\\bibitem{Platzer:2009jq}\n"
	"S.~Platzer and S.~Gieseke,\n"
	"``Coherent Parton Showers with Local Recoils,''\n"
	" JHEP {\\bf 1101}, 024 (2011)\n"
	"arXiv:0909.5593 [hep-ph].\n"
	"%%CITATION = ARXIV:0909.5593;%%\n"
	"%\\cite{Platzer:2011bc}\n"
	"\\bibitem{Platzer:2011bc}\n"
	"S.~Platzer and S.~Gieseke,\n"
	"``Dipole Showers and Automated NLO Matching in Herwig,''\n"
	"arXiv:1109.6256 [hep-ph].\n"
	"%%CITATION = ARXIV:1109.6256;%%");

	static RefVector<DipoleShowerHandler,DipoleSplittingKernel> interfaceKernels
	("Kernels",
	"Set the splitting kernels to be used by the dipole shower.",
	&DipoleShowerHandler::kernels, -1, false, false, true, false, false);


	static Reference<DipoleShowerHandler,DipoleEvolutionOrdering> interfaceEvolutionOrdering
	("EvolutionOrdering",
	"Set the evolution ordering to be used.",
	&DipoleShowerHandler::theEvolutionOrdering, false, false, true, false, false);


	static Reference<DipoleShowerHandler,ConstituentReshuffler> interfaceConstituentReshuffler
	("ConstituentReshuffler",
	"The object to be used to reshuffle partons to their constitutent mass shells.",
	&DipoleShowerHandler::constituentReshuffler, false, false, true, true, false);


	static Reference<DipoleShowerHandler,IntrinsicPtGenerator> interfaceIntrinsicPtGenerator
	("IntrinsicPtGenerator",
	"Set the object in charge to generate intrinsic pt for incoming partons.",
	&DipoleShowerHandler::intrinsicPtGenerator, false, false, true, true, false);

	static Reference<DipoleShowerHandler,AlphaSBase> interfaceGlobalAlphaS
	("GlobalAlphaS",
	"Set a global strong coupling for all splitting kernels.",
	&DipoleShowerHandler::theGlobalAlphaS, false, false, true, true, false);


	static Switch<DipoleShowerHandler,bool> interfaceDoFSR
	("DoFSR",
	"Switch on or off final state radiation.",
	&DipoleShowerHandler::doFSR, true, false, false);
	static SwitchOption interfaceDoFSROn
	(interfaceDoFSR,
	"On",
	"Switch on final state radiation.",
	true);
	static SwitchOption interfaceDoFSROff
	(interfaceDoFSR,
	"Off",
	"Switch off final state radiation.",
	false);

	static Switch<DipoleShowerHandler,bool> interfaceDoISR
	("DoISR",
	"Switch on or off initial state radiation.",
	&DipoleShowerHandler::doISR, true, false, false);
	static SwitchOption interfaceDoISROn
	(interfaceDoISR,
	"On",
	"Switch on initial state radiation.",
	true);
	static SwitchOption interfaceDoISROff
	(interfaceDoISR,
	"Off",
	"Switch off initial state radiation.",
	false);

	static Switch<DipoleShowerHandler,int> interfaceRealignmentScheme
	("RealignmentScheme",
	"The realignment scheme to use.",
	&DipoleShowerHandler::realignmentScheme, 0, false, false);
	static SwitchOption interfaceRealignmentSchemePreserveRapidity
	(interfaceRealignmentScheme,
	"PreserveRapidity",
	"Preserve the rapidity of non-coloured outgoing system.",
	0);
	static SwitchOption interfaceRealignmentSchemeEvolutionFractions
	(interfaceRealignmentScheme,
	"EvolutionFractions",
	"Use momentum fractions as generated by the evolution.",
	1);
	static SwitchOption interfaceRealignmentSchemeCollisionFrame
	(interfaceRealignmentScheme,
	"CollisionFrame",
	"Determine realignment from collision frame.",
	2);


	static Switch<DipoleShowerHandler,bool> interfaceChainOrderVetoScales
	("ChainOrderVetoScales",
	"[experimental] Switch on or off the chain ordering for veto scales.",
	&DipoleShowerHandler::chainOrderVetoScales, true, false, false);
	static SwitchOption interfaceChainOrderVetoScalesOn
	(interfaceChainOrderVetoScales,
	"On",
	"Switch on chain ordering for veto scales.",
	true);
	static SwitchOption interfaceChainOrderVetoScalesOff
	(interfaceChainOrderVetoScales,
	"Off",
	"Switch off chain ordering for veto scales.",
	false);

	interfaceChainOrderVetoScales.rank(-1);


	static Parameter<DipoleShowerHandler,unsigned int> interfaceNEmissions
	("NEmissions",
	"[debug option] Limit the number of emissions to be generated. Zero does not limit the number of emissions.",
	&DipoleShowerHandler::nEmissions, 0, 0, 0,
	false, false, Interface::lowerlim);

	interfaceNEmissions.rank(-1);


	static Switch<DipoleShowerHandler,bool> interfaceDiscardNoEmissions
	("DiscardNoEmissions",
	"[debug option] Discard events without radiation.",
	&DipoleShowerHandler::discardNoEmissions, false, false, false);
	static SwitchOption interfaceDiscardNoEmissionsOn
	(interfaceDiscardNoEmissions,
	"On",
	"Discard events without radiation.",
	true);
	static SwitchOption interfaceDiscardNoEmissionsOff
	(interfaceDiscardNoEmissions,
	"Off",
	"Do not discard events without radiation.",
	false);

	interfaceDiscardNoEmissions.rank(-1);

	static Switch<DipoleShowerHandler,bool> interfaceFirstMCatNLOEmission
	("FirstMCatNLOEmission",
	"[debug option] Only perform the first MC@NLO emission.",
	&DipoleShowerHandler::firstMCatNLOEmission, false, false, false);
	static SwitchOption interfaceFirstMCatNLOEmissionOn
	(interfaceFirstMCatNLOEmission,
	"On",
	"",
	true);
	static SwitchOption interfaceFirstMCatNLOEmissionOff
	(interfaceFirstMCatNLOEmission,
	"Off",
	"",
	false);

	interfaceFirstMCatNLOEmission.rank(-1);


	static Parameter<DipoleShowerHandler,int> interfaceVerbosity
	("Verbosity",
	"[debug option] Set the level of debug information provided.",
	&DipoleShowerHandler::verbosity, 0, 0, 0,
	false, false, Interface::lowerlim);

	interfaceVerbosity.rank(-1);


	static Parameter<DipoleShowerHandler,int> interfacePrintEvent
	("PrintEvent",
	"[debug option] The number of events for which debugging information should be provided.",
	&DipoleShowerHandler::printEvent, 0, 0, 0,
	false, false, Interface::lowerlim);

	interfacePrintEvent.rank(-1);

	static Parameter<DipoleShowerHandler,Energy> interfaceRenormalizationScaleFreeze
	("RenormalizationScaleFreeze",
	"The freezing scale for the renormalization scale.",
	&DipoleShowerHandler::theRenormalizationScaleFreeze, GeV, 1.0GeV, 0.0GeV, 0*GeV,
	false, false, Interface::lowerlim);

	static Parameter<DipoleShowerHandler,Energy> interfaceFactorizationScaleFreeze
	("FactorizationScaleFreeze",
	"The freezing scale for the factorization scale.",
	&DipoleShowerHandler::theFactorizationScaleFreeze, GeV, 2.0GeV, 0.0GeV, 0*GeV,
	false, false, Interface::lowerlim);

	static Switch<DipoleShowerHandler,bool> interfaceDoCompensate
	("DoCompensate",
	"",
	&DipoleShowerHandler::theDoCompensate, false, false, false);
	static SwitchOption interfaceDoCompensateYes
	(interfaceDoCompensate,
	"Yes",
	"",
	true);
	static SwitchOption interfaceDoCompensateNo
	(interfaceDoCompensate,
	"No",
	"",
	false);

	static Parameter<DipoleShowerHandler,unsigned long> interfaceFreezeGrid
	("FreezeGrid",
	"",
	&DipoleShowerHandler::theFreezeGrid, 500000, 1, 0,
	false, false, Interface::lowerlim);

	static Reference<DipoleShowerHandler,DipoleEventReweight> interfaceEventReweight
	("EventReweight",
	"",
	&DipoleShowerHandler::theEventReweight, false, false, true, true, false);

	}

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