Graphical Class Hierarchy Node0 Trk::OverlapDescriptor Node1 HGTD_OverlapDescriptor Node0->Node1 Node2 InDet::DiscOverlapDescriptor Node0->Node2 Node3 InDet::PixelOverlapDescriptor Node0->Node3 Node4 InDet::SCT_OverlapDescriptor Node0->Node4 Node5 InDet::TRT_OverlapDescriptor Node0->Node5