TouchedMuonChamberHelper Node1 TouchedMuonChamberHelper - m_d + TouchedMuonChamberHelper() + ~TouchedMuonChamberHelper() + incrementNumberOfObjects ForPV() + decrementNumberOfObjects ForPV() + isTouchedByTrack() + eraseEventData() + updateTouchedByTracks() - checkForChangeInTouchedChambers() Node2 QObject Node2->Node1