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Draft: Removal of HepMC2 codes

Open Andrii Verbytskyi requested to merge averbyts/athena:HM3ONLY into main
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@@ -201,12 +201,7 @@ StatusCode GetLCDeadMaterialTree::execute()
******************************************** */
const McEventCollection* truthEvent=nullptr;
ATH_CHECK( evtStore()->retrieve(truthEvent, "TruthEvent") );
#ifdef HEPMC3
const HepMC::ConstGenParticlePtr& gen = truthEvent->at(0)->particles().front();
#else
HepMC::GenEvent::particle_const_iterator pit = truthEvent->at(0)->particles_begin();
const HepMC::GenParticle * gen = *pit;
#endif
double mc_eta = gen->momentum().pseudoRapidity();
double mc_phi = gen->momentum().phi();
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