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tickbox variable: $interpolatelutflag -- color LUT behavior
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default: 0 (FALSE)

The "interpolLUT" tickbox (right side of fn-F2
interface) controls color lookup table
interpolation.

If flag set, r,g,b's for val's in between table
entries are interpolated, else colors are
constant until val is midway between two table
entries.

See help for entry immediately above for more
details.
