Syntax:
set terminal next {<mode>} {<type> } {<color>} {<dashed>}
{"<fontname>"} {<fontsize>} title {"<newtitle>"}
where 4#4mode5#5 is default, which sets all options to their defaults; 4#4type5#5 is either new or old, where old invokes the old single window; 4#4color5#5 is either color or monochrome; 4#4dashed5#5 is either solid or dashed; "4#4fontname5#5" is the name of a valid PostScript font; 4#4fontsize5#5 is the size of the font in PostScript points; and 4#4title5#5 is the title for the GnuTerm window. Defaults are new, monochrome, dashed, "Helvetica", 14pt.
Examples:
set term next default
set term next 22
set term next color "Times-Roman" 14
set term next color "Helvetica" 12 title "MyPlot"
set term next old
Pointsizes may be changed with set linestyle.