ActsMaterialTrackWriterSvc Node1 ActsMaterialTrackWriterSvc - m_mTracks - m_writeMutex - m_writeThread - m_doEnd - p_tFile - p_tree - m_v_x - m_v_y - m_v_z - m_v_px and 38 more... + initialize() + finalize() + ActsMaterialTrackWriterSvc() + write() - writerThread() - doWrite() Node2 extends< AthService, IActsMaterialTrackWriterSvc > Node2->Node1