Robert Maier <rsm@math.arizona.edu> wrote libplot and the graphics programs
graph, plot, tek2plot, and plotfont, beginning in 1995.  The old `GNU
graphics' package (written by Rich Murphey <rich@freebsd.org> in 1989-1991)
served as a starting point, but the plotutils package is an order of
magnitude larger.  Probably none of the code from the earlier package
remains in libplot or the graphics programs.

spline and double were originally written by Rich.  They have been extended
by Robert, but some of Rich's code is still present.

Current versions of tek2plot are based on the Tektronix parser written by
Edward Moy <moy@parc.xerox.com> in the mid-1980's at Berkeley, which was
later included in the X11 distribution.

ode was written by Nick Tufillaro <nbt@reed.edu> in 1978-1994, and has been
somewhat modified and extended so as to merge it into the package.

Robert wrote the texinfo manual (the chapter on ode draws heavily on Nick's
original ode documentation, which dates in part to the late 1970s).
