source files: xgtm.[ch], term/*.trm, gtplot.h
(GT-2D-LINE-TYPE 2) (SEND <gtm:terminal> :2D-LINE-TYPE 2)
Set the line type. The type should be an integer from zero to 8 or so. Device drivers try to provide half a dozen or so different line types, which may be different colors or different types of dashes or whatever. Number which are out of range will be silently mapped to inrange ones.
This is an old-style call, not recommended for 3-D graphics.