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	diff --git a/src/Core/Event.cc b/src/Core/Event.cc
	--- a/src/Core/Event.cc
	+++ b/src/Core/Event.cc
	@@ -1,45 +1,44 @@
	// -- C++ --
	#include "Rivet/Event.hh"
	#include "Rivet/Tools/BeamConstraint.hh"
	#include "Rivet/Projections/Beam.hh"
	#include "HepMC/GenEvent.h"

	namespace Rivet {

	-
	double Event::weight() const {
	- return genEvent()->weights().empty() ? _genevent.weights()[0] : 1.0;
	+ return genEvent()->weights().empty() ? 1.0 : _genevent.weights()[0];
	}

	double Event::centrality() const {
	/// @todo Use direct "centrality" property if using HepMC3
	return genEvent()->heavy_ion() ? genEvent()->heavy_ion()->impact_parameter() : -1;
	}

	ParticlePair Event::beams() const { return Rivet::beams(*this); }

	double Event::sqrtS() const { return Rivet::sqrtS(beams()); }

	double Event::asqrtS() const { return Rivet::asqrtS(beams()); }



	void Event::_init(const GenEvent& ge) {
	// Use Rivet's preferred units if possible
	#ifdef HEPMC_HAS_UNITS
	_genevent.use_units(HepMC::Units::GEV, HepMC::Units::MM);
	#endif
	}


	const Particles& Event::allParticles() const {
	if (_particles.empty()) { //< assume that empty means no attempt yet made
	for (const GenParticle* gp : particles(genEvent())) {
	_particles += Particle(gp);
	}
	}
	return _particles;
	}


	}