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entry variable: $fadef -- ipsilateral fade out
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default: 0.7

The "fadef:" field controls the fraction of the
colorscale that is *not* grayed-out (yellowed-out
if ipsiyellowfact>0.0).  No effect on integral
angle_cycles.  At 0.99, ipsilateral graying-out
is disabled.  Lower fadef's result in a larger
percentage of phases being grayed-out.  At
fadef=0.0, 2/3 of color wheel is grayed out.
