Dear CCP4 users

Is there any easy way of calculating the peak height / number of electrons at a 
given position, say a mouse click point in coot.

Is there any formula to calculate the number of electrons based on sigma level 
and peak height, as given in difference map peaks in coot.

I have some peaks in my map which take water or sodium/magnesium or chlorine 
atom with out giving out any positive or negative density upon further 
refinement. 

The asymmetric unit has about 425 residues and the data resolution is 1.5A.

Thanks and regards

S. Thiyagarajan

Department of Cell and Organism Biology

Lund University

Sölvegatan 35

Lund, Sweden





      

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