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09 Nov 2012 Zernike decomposition Decomposition of a 2-D function by set of Zernike functions Author: Alex Chtchetinine

I'm using this code to decompose a wave aberration function. I'm experiencing a problem with the decomposition. Why if I try to expand a function like
F = A*r^4
where A is constant, I get 2 non-negative coefficients: not only the coefficient corresponding to spherical aberrations but also that one who correspond to Field Curvature ?!?!

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