Syntax:
set terminal pm {server {n}} {persist} {widelines} {enhanced} {"title"}
If persist is specified, each graph appears in its own window and all windows remain open after gnuplot exits. If server is specified, all graphs appear in the same window, which remains open when gnuplot exits. This option takes an optional numerical argument which specifies an instance of the server process. Thus multiple server windows can be in use at the same time.
If widelines is specified, all plots will be drawn with wide lines. If enhanced is specified, sub- and superscripts and multiple fonts are enabled using the same syntax as the enhanced postscript option (see set terminal postscript enhanced (p. ) for details). Font names for the basic PostScript fonts may be abbreviated to single letters.
If title is specified, it will be used as the title of the plot window. It will also be used as the name of the server instance, and will override the optional numerical argument.
Linewidths may be changed with set linestyle.