15.64.25  FILL 

SET FILL [ENTRY[=n]] [FULL] [SIZE[=n]] [ANGLE[=n]] [ALTERNATE=[ON|OFF]]
          [WIDTH|INTENSITY=n] [NOCOLOR|WHITE|RED|GREEN|BLUE|YELLOW|
          MAGENTA|CYAN] [NOTEXTURE|SOLID|DOTS|DASHES|DAASHES|DOTDASH|
          PATTERNED|FUNNY|SPACE]
This  selects  a  fill  attributes to be used when the FILL option is used
with HISTOGRAM, JOIN, or PLOT.  This selects the type of cross hatch fill.
Up to 4 different lines may be used.
     1.  ALTERNATE  selects  filling  alternate  areas.  If off the entire
         area bounded by the outside of the curve is filled.  (Default:ON)
     2.  ENTRY selects the fill entry to change.  If n is omitted the next
         entry is selected.
     3.  FULL  sets the fill size to be the same as the screen resolution,
         the angle is set to 90, and the WIDTH is set to 1.
     4.  SOLID...  selects the line texture to use.  (Default:NONE)
     5.  WHITE...  selects the line color to use.  (Default:NONE)
     6.  ANGLE  the  angle  that  the  line  is  to  be  drawn  at.   0 is
         horizontal, while 90 is straight up and down.
         (Default:+-45 degrees)
     7.  SIZE  the  separation  between  the  lines.   If negative this is
         specified in pixels.  If positive it is specified in inch.
         (Default:0.1)
     8.  WIDTH  selects  the  line  width  to  use (0 to 5).  A width of 0
         indicates no width is selected.
         (Default:NONE)
IF  no  options  are specified, the fill patterns are reset to the default
value.