Fig. 4.
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HEALPix pixel window function (red) for resolution parameters NSIDE = 256 (top), NSIDE = 1024 (middle), NSIDE = 4096 (bottom). Also shown is the convolution kernel of a spherical disc with the same pixel area (black). The HEALPix pixel window function is only provided up to l = 4 NSIDE, where it starts to fall below the kernel of the spherical disc.
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