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pst-contourplot PSTricks package
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Manuel Luque (c) 2018
The pst-contourplot package allows to draw implicit functions f(x,y)=0 with options for coloring the inside of the surfaces, to marking the points and arrowing the curve at points chosen by the user. This package uses the "marching squares" algorithm.
This material is subject to the LaTeX Project Public License. See
http://mirror.ctan.org/help/Catalogue/licenses.lppl.html
for the details of that license.