              Data items in the DIFFRN_REFLNS category record details about\
               the set of intensities measured in the diffraction experiment.\
\
               The DIFFRN_REFLN data items refer to individual intensity\
               measurements, and must be included in looped lists.\
\
               The DIFFRN_REFLNS data items specify the parameters that apply\
               to all intensity measurements in a diffraction data set.