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entry variable: $sfslope -- statmask contrast
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default: 1.5

This unmarked entry (second entry after "fslo:")
is only visible if "mask" ($statmaskampflag) is
ticked.

This entry controls steepness of the *stat mask*
color saturation sigmoid (or double sigmoids with
two-ended/signed color scales).

Smaller values give a more linear relation
between statistic and color saturation.  Larger
values approach a hard threshold.

See $fmid and $sfmid R-click help for more
details.
