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Fig. 2.
Spherical harmonics coupling kernel K for ℓ ≤ 60 for an unmasked (top) and a masked (bottom) sky. Multipole moments are listed in ℓ-major ordering with element numbering given by i = ℓ2 + ℓ + m + 1. The sky fraction for the masked case is 36%. The corresponding mask is plotted in Fig. 8.
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