Data items in the PHASING_SET_REFLN category record the values
of the measured structure factors used in a phasing experiment.
This list may contain information from a number of different
data sets; _phasing_set_refln.set_id indicates the data set
to which a given record corresponds.
_phasing_set_refln.set_id 'NS1-96'
_phasing_set_refln.index_h 15
_phasing_set_refln.index_k 15
_phasing_set_refln.index_l 32
_phasing_set_refln.F_meas_au 181.79
_phasing_set_refln.F_meas_sigma_au 3.72