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Fig. 3.
Legendre Polynomials up to the fifth order. The summation of all harmonics, multiplied by a coefficient, reproduces the final PAD. Shown are i = 0, which represents the mean value; the even harmonics (2, 4), which are symmetric along cos(θ) = 0; and the odd harmonics (1, 3, 5), which are antisymmetric.
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