xAODMaker::ITrackParticleCompressorTool Node1 xAODMaker::ITrackParticle CompressorTool + compress() + interfaceID() Node3 xAODMaker::TrackParticle CompressorTool - m_offDiagCovMatrixBits - m_diagCovMatrixBits - m_useOffDiagCompr - m_diagCovMatrixCompressor + TrackParticleCompressorTool() + initialize() + compress() Node1->Node3 Node2 IAlgTool Node2->Node1