fig2.py this is the python script that is used to produce fig2.pdf and fig2.gif associated with the paper94. 

fig2.mp4 is produced from fig2.gif (animated gif) via a Linux command

ffmpeg -i fig2.gif -c:v libx264 -crf 15 -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" fig2.mp4