next up previous contents
Next:  CHILimit f Up: CALCULUS AND LIMITS-RELATED KEYWORDS. Previous:  CONStant_lambda   Contents


 REMOve_origin_peak

This keyword is intended for calculation of origin-removed Patterson functions. This is achieved by subtracting the average F2 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