They are SigmaA weighting coefficients. See the sigmaa documentation - and references there in by Read. (I think the 1986 reference is the correct one).

Ezra


Mayer, Mark (NIH/NICHD) [E] wrote:
Hi,

What do m and D indicate in the Fourier coefficients for a 2mFo-DFc map?

I've dug a bit in web and CCP4 doc  but not found an explanation, though I'm 
sure its there.

Thanks,

Mark

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