URL https://ai2-s2-public.s3.amazonaws.com/figures/2017-08-08/efeb59fc84e954c6eb0fcc7e39fa571fc636ae32/3-Figure2-1.png
URL2 https://www.semanticscholar.org/paper/Spherical-Near-Field-to-Far-Field-Transformation-on-Wang-Wen/efeb59fc84e954c6eb0fcc7e39fa571fc636ae32/figure/1
