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switch variable: $colscale -- funct color scale
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switch value: 1 => pos heat scale (complex data)

The scale requires complex-valued data.  It runs
from dark brown to white and displays any brain
region significantly activated in a periodic
fashion (i.e., all phases).  Truncphase can be
used to truncate half of the phases and
angle_offset controls the exact half that are
truncated.

The angle_offset for two condition expt with 20s
ON and 20s OFF should be something like 0.1 (this
is in units of one cycle: 0.1 * 40 sec = 4 sec
delay).
