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entry variable: $truncphasemin -- truncate phase min
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default: 0.25

The left unlabeled entry below the "truncphase"
tickbox is $truncphasemin.

This is only used for complex-valued data if
"truncphase" is ticked ($truncphaseflag is 1).
It adjusts the min phase angle below which color
scale is hard truncated to background grays.
Applied *after* $revphaseflag, $invphaseflag, and
$angle_offset.  Effects are also shown in phase
wheel inset at lower right of display window.
For gradual fade out, use fadef instead (or in
addition).

The truncphase limits wrap.  For example: 

  trunphasemin=0.3 truncphase=0.9
    => show phases between 0.3 and 0.9

  trunphasemin=0.9 truncphase=0.3
    => show phases between 0.9 and 1.0
    => show phases between 0.0 and 0.3


Truncphase{min,max) overloaded to control real-valued

The $trunphasemin and $trunphasemax fields are
also used to control the data-value endpoints of
the real-valued MATLAB JET colorscale ("jet") and
the CARET 'videen-style' colorscale ("vd"),
accessible from the popup available by R-clicking
the "Col:" label.
