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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
>
> --
> ​
> --
> *​----------------------------------*
> *Mohamed Ibrahim              *
>
> *Humboldt University           *
> *Berlin, Germany                  *
>
> *Tel: +49 30 209347931  *
>