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Standard tcl script: offsetmovie.tcl
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This script successively changes the
$angle_offset value (thus rotating the color map)
in 50 steps (defaultl), saving a bitmap for each
step.

This can be used to find the most visually
informative $angle_offset setting for color wheel
data (color scale "w1").

It can also be used to find the best delay
(=$angle_offset) for two condition data analyzed
with the fourier method, and visualized, for
example, with colorscale "bi".
