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Hi Hailiang, m is typically determined per resolution bin using test reflections and it can range from 0 to 1, so the difference between corresponding mFo and Fo can range accordingly. You can read more on this, for example: Acta Cryst. A42 (1986) 140-149. Acta Cryst. (1995). A51, 880-887. J. Appl. Cryst. (1996). 29, 741-744. and numerous references therein. Pavel. On 8/31/10 10:15 AM, Hailiang Zhang wrote: > Hi, > > I want to see how the mFo maps (NOT 2mFo-DFc) compare against Fo maps. In > the SIGMAA documentation, it says WCMB is the figure of merit; however, I > opened in coot with "FP PHIC WCMB" combination, and for lots of systems, I > didn't see too much difference against "FP PHIC" maps. Is the difference > between mFo and Fo maps supposed to be very small? > > Best Regards, Hailiang