loop_
    _pdbx_reflns_twin.diffrn_id
    _pdbx_reflns_twin.crystal_id
    _pdbx_reflns_twin.type
    _pdbx_reflns_twin.operator
    _pdbx_reflns_twin.fraction
    _pdbx_reflns_twin.mean_I2_over_mean_I_square
    _pdbx_reflns_twin.mean_F_square_over_mean_F2
       1 1  merohedral     'h,-h-k,-l'   .43   1.3  .84