Syntax:
set terminal next {<mode>} {<type> } {<color>} {<dashed>}
{"<fontname>"} {<fontsize>} title {"<newtitle>"}
where 5#5mode6#6 is default, which sets all options to their defaults; 5#5type6#6 is either new or old, where old invokes the old single window; 5#5color6#6 is either color or monochrome; 5#5dashed6#6 is either solid or dashed; "5#5fontname6#6" is the name of a valid PostScript font; 5#5fontsize6#6 is the size of the font in PostScript points; and 5#5title6#6 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.