MuonTrackStatisticsTool::TruthTrackCounters Node1 MuonTrackStatisticsTool ::TruthTrackCounters + nEvents + nTracks + nPIXELhits + nSCThits + nTRThits + nMDThits + nRPChits + nTGChits + nCSChits + TruthTrackCounters() Node2 std::string Node2->Node1 +trackLocation Node3 std::basic_string< char > Node3->Node2