centos7 HepMC3 contains MRs: https://gitlab.cern.ch/atlas/athena/-/merge_requests/69548 Remove legacy simulation configs https://gitlab.cern.ch/atlas/athena/-/merge_requests/69536 Update HepMcParticleLink interface and clients without changing behaviour https://gitlab.cern.ch/atlas/athena/-/merge_requests/69691 Update SUSY_SimplifiedModel_PreInclude.py https://gitlab.cern.ch/atlas/athena/-/merge_requests/69506 Move some functions from MCTruthClassifier to TruthUtils https://gitlab.cern.ch/atlas/athena/-/merge_requests/69607 Move RngComps.RandomServices module to RngComps.RngCompsConfig https://gitlab.cern.ch/atlas/athena/-/merge_requests/69581 Andrej Saibel corrections to SFGen Athena interface https://gitlab.cern.ch/atlas/athena/-/merge_requests/69099 Move more functions from MCTruthClassifier to TruthUtils https://gitlab.cern.ch/atlas/athena/-/merge_requests/69737 HepMC::uniqueID should return id rather than barcode for HepMC3 https://gitlab.cern.ch/atlas/athena/-/merge_requests/69834 Delete a trivial wrapped getParentHadronID https://gitlab.cern.ch/atlas/athena/-/merge_requests/67602 Update HepMcParticleLink to handle creation with GenParticle::id() as well as barcodes https://gitlab.cern.ch/atlas/athena/-/merge_requests/69721 Update to LCG_104d_ATLAS_9, main branch (2024.03.11.)