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variable: $fillcolor3d -- 3d fill color
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default: 128

Grayscale color (0-255) to use for 3d fill.

If the volume will be used to make a surface
(e.g., using the program, surf), the fill colors
for the left and right hemispheres should match
the settings in the Expert Preferences -> Fill WM
panel (also used in the Surf panel).

The default colors are RH=127, LH=255.
