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switch variable: $colscale -- funct color scale
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switch value: 11 => blue/red to yellow/cyan (real data)

The "BRy" (blue/red -> cyan/yellow) color scale
is for real-valued, possibly signed statistics.

Red is positive and blue is negative, which can
be reversed by ticking "invph" (set $invphaseflag
to 1).

As significance increases, the scale changes from
red->yellow and blue->cyan.

Not affected by $angle_offset, $angle_cycles,
and $revphaseflag.

Unlike other scales, the units of $fmid and
$fthresh are *not* equivalent -- $fmid should
always be higher than fthresh.  If fmid is set
less than $fthresh, there is a warning, and you
get green colors.

The setting of $fthresh sets the roll off to
background grays, while the setting of $fmid sets
the red->yellow and blue->cyan transition
points.

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Alt (mid-click): shortcut to get "jet" w/o fn-F3
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Middle-clicking the "BRy" button switches to the
"jet" MATLAB wheel (colscale=15) without having
to use the the "Col:" popup or the extended
(fn-F3) panel.
