Set the default edge color index. Without specifying this option the default edge color index is 0. The minimum color index is 0, the maximum color index depends on your graphics hardware (but is often 255).
/dec 26
Set the default edge color index to 26.
This option uses color indices and not color values.
The resulting colors depend on the colors setting of the
desktop environment.
The option has currently no effect to the PostScript output.