The source code is here: at github

The eza in the name is for easy axisymmetric. Perhaps n is new and 3 is version? I believe this code is what I used as the companion axisymmetric code in my 2009 QJ article. It produces slightly difference results than the code for axisymmetric simulations prior to 2009, mainly because the viscosity profile was simplified for compatibility with the 3-D Fortran CFD code for tornado-like vortices.

wget https://github.com/bfiedler/ezan/blob/main/ezan3_2025.tar.gz
gunzip ezan3_2025.tar.gz
tar xvf ezan3_2025.tar
cd ezan3_2025
./Runall

This will require about 15 minutes of wall clock on an ancient PC with an i7 chip.

Note the change in contour intervals, so the extremes can be detected.