Internal Program Version: contourpy  1.0.7

A Python library for calculating contours of 2D quadrilateral grids

It contains the 2005 and 2014 algorithms used in Matplotlib as well
as a newer algorithm that includes more features and is available
in both serial and multithreaded versions. It provides an easy way
for Python libraries to use contouring algorithms without having
to include Matplotlib as a dependency.

https://github.com/contourpy/contourpy