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. Author manuscript; available in PMC: 2020 Feb 27.
Published in final edited form as: J Opt Soc Am A Opt Image Sci Vis. 2019 Aug 1;36(8):1334–1345. doi: 10.1364/JOSAA.36.001334

Fig. 6.

Fig. 6.

Square-integrable functions on the sphere can be written as a weighted sum of spherical harmonics. The = 0, m = 0 spherical harmonic can represent a constant function (left), m = 0 spherical harmonics can represent rotationally symmetric functions (center), and m ≠ 0 spherical harmonics can represent non-rotationally symmetric functions (right).