Hi Neno

I think you mean the total number of electrons in the volume, i.e. the
volume integral of the electron density, or perhaps you mean the average
electron density, i.e. the total number of electrons in the volume divided
by the volume.

Cheers

-- Ian



On Wed, 10 Aug 2022, 15:00 Neno Vuksanovic, <coelicolo...@gmail.com> wrote:

> Dear All,
>
> I would like to quantify electron density inside of positive Fo-Fc blobs
> in active sites of multiple protomers in the map and compare them. I am
> aware that I can interpolate maps and obtain density values at coordinate
> points using either MapMan, Chimera or Coot, but I would like to know if
> there is a tool that would let me designate a sphere of a certain volume
> and calculate total electron density inside it?
>
> Best Regards,
> Neno
>
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