Data items in the PHASING_MAD_CLUST category record details about a cluster of experiments that contributed to the generation of a set of phases.
loop_ _phasing_MAD_clust.id _phasing_MAD_clust.expt_id _phasing_MAD_clust.number_set 'four wavelength' 1 4 'five wavelength' 1 5 'five wavelength' 2 5