              Data items in the PHASING_MIR category record details about\
               the phasing of the structure, when methods involving isomorphous\
               replacement are involved.\
\
               All isomorphous based techniques are subsumed in this category,\
               including single isomorphous replacement (SIR), multiple\
               isomorphous replacement (MIR), single or multiple isomorphous\
               replacement plus anomalous scattering (SIRAS, MIRAS).