Trk::TransformNtupleBranch Node1 Trk::TransformNtupleBranch + initForWrite() + initForRead() + fill() + fill() Node2 Trk::MatrixNtupleBranch + m_nrows + m_ncols + m_matrix + COLMAX + ROWMAX + initForWrite() + initForRead() + fill() + fill() Node2->Node1 +m_rotation Node3 Trk::VectorNtupleBranch + m_nrows + m_vector + ROWMAX + initForWrite() + initForRead() + fill() + fill() + fill() + fill() + fill() Node3->Node1 +m_translation