The `set title` command produces a plot title that is centered at the top of
the plot. `set title` is a special case of `set label` (Note:label ).
Syntax:
set title {"<title-text>"} {<xoff>}{,<yoff>} {"<font>,{<size>}"}
show title
Specifying constants <xoff> or <yoff> as optional offsets for the title will
move the title <xoff> or <yoff> character screen coordinates (not graph
coordinates). For example, "`set title ,-1`" will change only the y offset
of the title, moving the title down by roughly the height of one character.
<font> is used to specify the font with which the title is to be written;
the units of the font <size> depend upon which terminal is used.
`set title` with no parameters clears the title.
See `syntax` (Note:Syntax ) for details about the processing of backslash
sequences and the distinction between single- and double-quotes.