Instead of thinking about the coloring, it would be clearer to ask how much surface area has electrostatic potential value >= 5. Chimera does not have any code to compute that, although it is something we could add to ChimeraX.

On Sep 11, 2019, at 7:27 PM, Fernando Villa <fer.vdl1928@gmail.com> wrote:

Dear all Chimera users

In UCSF ChimeraX version 0.91 (2019-08-30)
I opened a .pqr file (generated with pdb2pqr in Chimera 1.14) and then I opened a .dx file (generated with APBS in Chimera 1.14)

Then I input the commands:

>surface
>color electrostatic #1 map #2 palette -10,red:0,white:10,blue

<image.png>
Is it possible to calculate the red and blue area in Å2 of the molecule?

Best regards,

Fernando

ATTE
Fernando Villa Díaz

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