Trk::IPropagationEngine Node1 Trk::IPropagationEngine # m_sopPrefix # m_sopPostfix + ~IPropagationEngine() + propagate() + propagate() + interfaceID() Node3 Trk::PropagationEngine # m_propagator # m_pathLimitTolerance + PropagationEngine() + ~PropagationEngine() + initialize() + finalize() + propagate() + propagate() + propagate() + propagate() Node1->Node3 Node2 IAlgTool Node2->Node1