Graphical Class Hierarchy Node0 FPTracker::IBeamElement Node1 FPTracker::Collimator Node0->Node1 Node2 FPTracker::EmptySpaceElement Node0->Node2 Node3 FPTracker::Magnet Node0->Node3 Node4 FPTracker::Plane Node0->Node4 Node5 FPTracker::SolenoidElement Node0->Node5