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meaning of Color of volumes and surfaces


I analysed free volume of polymer in a cell using "Atom volumes and surfaces" tool and got surface like below:
I want to know that is there any meaning for the color of the surface, what is the meaning of gray and blue color. Any help?. Thank you.

CarstenCarsten (Accelrys) 
This is from the help:
If the Solid display style is chosen, the inside of the isosurface is usually rendered in gray.

So blue is the outside.

If you select the surface on do: Right-mouse click->Display Style->Isosurface this can be changed by the High values inside check box