====zernike====

zernike https://github.com/jacopoantonello/zernike

GalSim https://galsim-developers.github.io/GalSim/_build/html/index.html

optics.zernike https://www2.ph.ed.ac.uk/~wjh/teaching/Python/optics.zernike.html#ZernikeExpansion 

Overview of Sigfit https://www.youtube.com/watch?v=nFiy_0iYK3M

sigfit https://www.zdfans.com/html/71521.html