Data items in the PHASING_MIR category record details about
the phasing of the structure where methods involving isomorphous
replacement are involved.
All isomorphous-replacement-based techniques are covered
by this category, including single isomorphous replacement (SIR),
multiple isomorphous replacement (MIR) and single or multiple
isomorphous replacement plus anomalous scattering (SIRAS, MIRAS).
_phasing_MIR.method
; Standard phase refinement (Blow & Crick, 1959)
;