def METHOD_NAME(self, pp_index, tp_index, dp_index):
    assert dp_index < len(self._3d_file_map), f'DP index {dp_index} >= DP degree {len(self._3d_file_map)}'
    dp_2d_map = self._3d_file_map[dp_index]
    return dp_2d_map.get_data(pp_index, tp_index)