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Hi, first maps are produced by Refmac, not Coot, and second it shouldn't be called sigma because it's not an uncertainty, it's a root-mean-square deviation from the mean.  The equation for the RMSD can be found in any basic text on statistics, e.g. just type 'RMSD' in Wikipedia.

Cheers

-- Ian


On 19 April 2018 at 13:20, Mohamed Ibrahim <[log in to unmask]> wrote:
Dear COOT users,

Do you know how to extract the equations that COOT uses for generating the maps and calculating the sigma values? 

Best regards, 
Mohamed 

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Mohamed Ibrahim          
   
                  
   
 
Humboldt University     
   
   
Berlin, Germany