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switch variable: $colscale -- funct color scale
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switch value: 6 => blu/red to white (real data)

Two-condition statistic color scale for real
signed data.  Red positively correlated, blue
negatively correlated (reversible with
revphaseflag).  As significance increases, scale
goes to white for both positive and negative
correlations.  Not affected by angle_offset,
angle_cycles.
