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tool A command-driven interactive graphing program. Gnuplot
can plot two-dimensional functions and data points in many
different styles (points, lines, error bars); and
three-dimensional data points and surfaces in many different
styles (contour plot, mesh). It supports complex arithmetic
and user-defined functions and can label title, axes, and data
points. It can output to several different graphics file
formats and devices. Command line editing and history are
supported and there is extensive on-line help.
Gnuplot is copyrighted, but freely distributable. It was
written by Thomas Williams, Colin Kelley, Russell Lang, Dave
Kotz, John Campbell, Gershon Elber, Alexander Woo and many
others. Despite its name, gnuplot is not related to the GNU
project or the FSF in any but the most peripheral sense. It
was designed completely independently and is not covered by
the General Public License. However, the FSF has decided
to distribute gnuplot as part of the GNU system, because it
is useful, redistributable software.