              Data items in the DIFFRN_REFLN category record details about\
               the intensities measured in the diffraction data set \
               identified by _diffrn_refln.diffrn_id.\
\
               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 the particular diffraction\
               data set identified by _diffrn_reflns.diffrn_id.