G4UA::G4AtlasUserActions Node1 G4UA::G4AtlasUserActions Node2 std::vector< G4UserStepping Action * > + elements Node2->Node1 +steppingActions Node3 std::vector< G4UserTracking Action * > + elements Node3->Node1 +trackingActions Node4 std::vector< G4UserStacking Action * > + elements Node4->Node1 +stackingActions Node5 std::vector< G4UserRunAction * > + elements Node5->Node1 +runActions Node6 std::vector< G4UserEvent Action * > + elements Node6->Node1 +eventActions