Hi Rex I would assume it's the RMS deviation of the rotation function value from the mean. If so then it's defined in the same way as the "population standard deviation" as given here: http://en.wikipedia.org/wiki/Standard_deviation
Cheers -- Ian On Fri, Sep 9, 2011 at 4:20 PM, REX PALMER <rex.pal...@btinternet.com>wrote: > Dear CCP4'ers > > In the input instructions for ALMN it says: > FIND peak maxpek [RMS] [OUTPUT filename] > Read peak threshold and maximum number of peaks. MAXPEK is the maximum > number of peaks to find (default = 20). Up to MAXPEK peaks above PEAK will > be found, and all symmetry related peaks generated. > If the keyword RMS is present, then the peak threshold is PEAK * RMS > density, otherwise PEAK is the absolute threshold in the scaled map. > Question: RMS density of what and what is the formula used? > > Rex Palmer > http://www.bbk.ac.uk/biology/our-staff/emeritus-staff > http://rexpalmer2010.homestead.com >
