NtupleTrackSelector Node1 NtupleTrackSelector + NtupleTrackSelector() + clone() + selectTrack() + selectTrack() + selectTracks() + selectTracks() + clear() Node2 TrackSelector # m_tracks # m_selector + TrackSelector() + ~TrackSelector() + clone() + addTrack() + addTracks() + tracks() + tracks() + size() + clear() + delete_track() # cleanup() Node2->Node1