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variable: $normdfracmax -- max dist (fraction) on norm
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default: 0.0 or 0.8

"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)

  find_orig_vertex_coordinates
  (upper right SEND button)

  write_val_visible_vertices
  (left-clk "W" button on "label:" line)

This sets the ending position of the search
along the vertex normal as a 0.0 to 1.0 fraction
of the cortical thickness at this vertex.

Negative numbers or numbers beyond the pial
surface are accepted.
