Table 1. Map data labels output by common crystallography software, including DM (Zhang et al., 1997 ▶), Parrot (Cowtan, 2010 ▶), Pirate (Cowtan, 2000 ▶) and autoSHARP (Vonrhein et al., 2007 ▶).

Source of MTZ	Column labels for ‘best’ map
DM	FDM, PHIDM
Parrot	parrot.F_phi.F, parrot.F_phi.phi
Pirate	pirate.F_phi.F, pirate.F_phi.phi
autoSHARP (phasing)	FP, PHIB (or Fcent, PHIcent if light atoms only)
autoSHARP (post-SOLOMON)	FBsol, PHIBshasol (or Fcentshasol, PHIcentshasol if light atoms only)