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variable: $dimredcurvfact -- dim red for better contrast
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default: 1.0

Dims red (sulcus) in curvature display.  This
provides (e.g., at 0.8) better contrast for full
color illustrations, better conversion to B/W,
and better visibility for red-green colorblind.

This has no effect on contrast of light/dark gray
curvature with data overlay; use $cvfact to
adjust that.
