loop_ _pdbx_supporting_exp_data_set.ordinal _pdbx_supporting_exp_data_set.data_content_type _pdbx_supporting_exp_data_set.data_version_major _pdbx_supporting_exp_data_set.data_version_minor _pdbx_supporting_exp_data_set.details 1 'X-ray structure factor amplitudes' 1 2 ?