Graphical Class Hierarchy Node0 HLT::MET::PeriodicGridBase Node1 HLT::MET::PufitGrid Node0->Node1 Node2 HLT::MET::PufitMultiGrid< N > Node0->Node2 Node3 HLT::MET::PufitMultiGrid< 3 > Node0->Node3 Node4 HLT::MET::PUSplitGrid Node3->Node4