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Fig. E.1

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Rotation matrix D of Eq. (E.5) for Euler angles (α,β,γ) = (120°, 60°, 270°). Left: Modulus of the matrix coefficients. Right: Argument of the matrix coefficients (degrees). The truncation degree of the set of SPHs is set to L = 4. The SPHs are sorted in ascending order of degrees (l = 0, 1 , 2, 3, 4), with orders (−lml) grouped together.

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