!! +exec+ +ins+
tit:insplot3d
type:$type_pexec
syntax:!insplot3d ``plotsource''
mean:As for $(ref1)cmdlist_insplot_$(ref2)cmdlist_insplot_">insplot</a>,\
  but ``plotsource'' is in the syntax of the ``splot'' command of gnuplot, and a 3D\
  surface will be plotted.
