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entry variable: $angle_offset -- rotate phase colscale
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default: 0.0

The "angoff:" entry (on lower right of fn-F2
panel) adjusts the rotational offset of phase
color scales.

Values from 0.0 to 1.0 rotate the color scale in
a clockwise direction from 0 to 360 degrees.  For
a default polar angle stimulus slowly rotating in
the clockwise direction, slightly increasing the
value above 0.0 will compensate for a longer
hemodynamic delay.
