G4AtlasSvc Node1 G4AtlasSvc - m_isMT - m_activateParallelGeometries + G4AtlasSvc() + ~G4AtlasSvc() + initialize() Node2 extends< AthService, IG4AtlasSvc > Node2->Node1 Node3 ServiceHandle< IUserLimits Svc > Node3->Node1 -m_userLimitsSvc Node4 ServiceHandle< IPhysicsList Svc > Node4->Node1 -m_physicsListSvc Node5 ServiceHandle< IDetector GeometrySvc > Node5->Node1 -m_detGeoSvc