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REMOve_origin_peak

This keyword is intended for calculation of origin-removed Patterson functions. This is
achieved by subtracting the average *F*^{2} from all contributing observations. DO NOT USE
THIS KEYWORD : the correct way to do the calculation is to subtract the local (in thin
resolution shells) average of the observations (and not the global average). If you want
an origin-removed Patterson function and you have CCP4 installed, use the program
` ecalc` to calculate the coefficients.

NMG, Nov 2002