15.64.41  PATTERN 

This selects the pattern for patterned lines.  These are produced by JOIN,
HIST,  PLOT,  or BAR commands.  This option remains the same until changed
by a SET PATTERN command.
SET PATTERN [RANDOM|FUNNY] [DOT] [DASH] [DAASH] [SPACE] [SIZE=n]
          [PERMANENT]
SET PATTERN p1 s1 p2 s2 ....p10 s10

     1.  RANDOM - The distance following this is random.
     2.  DOT - Draws a single dot followed by a 0.1" space.
     3.  DASH - Draws a short dash 0.1" long followed by 0.1" space.
     4.  DAASH - Draws a long dash 0.3" followed by 0.1" space.
     5.  SPACE - Adds 0.05" of blank space.
     6.  SIZE=n  -  Size  of  dashes,  and the distance between dashes and
         dots.
         (Default:0.1)
     7.  p = distance to draw in inches.  If negative it varies randomly.
     8.  s = distance to skip in inches.  If negative it varies randomly.
     9.  PERMANENT - Makes the current SIZE the permanent default.

You  may  enter  up  to  a  maximum  of  20  values  or  10 DOT/DASH/DAASH
specifiers.  Random values vary from zero to the value specified.  You may
also specify patterns as part of any drawing command.  For example:
     TD:HISTOGRAM PATTERN DOT DOT DASH
          is the same as ...
     TD:SET PATTERN DOT DOT DASH;  HISTOGRAM PATTERN
          or...
     TD:HISTOGRAM DOT DOT DASH
See:Command SET TEXTURE