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variable: $normddstep -- sample step (mm or frac)
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default: 0.25 (mm) or 0.1 (frac)

"NormSamp, Clust Controls" parameter.  To adjust,
access pop-up by L-click on "label:" (bold).

This variable affects the operation of both of
the following functions:

  write_label_timecourses_stats
  ("label:" line "T" and "S" buttons)

  paint_surface
  ("val3d:" line "PAINT" button)

This variable sets the step size along the vertex
normal in either millimeters or fraction of
cortical thickness.
