G4UA::iGeant4::MCTruthUserActionTool Node1 G4UA::iGeant4::MCTruthUser ActionTool - m_config + MCTruthUserActionTool() # makeAndFillAction() Node2 G4UA::UserActionToolBase < MCTruthUserAction > # m_actions + UserActionToolBase() + fillUserAction() # makeAndFillAction() Node2->Node1 Node3 extends< AthAlgTool, IUserActionTool > Node3->Node2