Fig. 7.
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Argument of the phase factor bias e−2i (α − α′) for HEALPix maps with NSIDE = 1, 4, 16, 64, shown in orthographic projection with the north pole at the centre and the equator at the border. The angles α and α′ are defined in Appendix C. For NSIDE = 64, the resolution is at the degree-scale, and the phase factors are close to unity.
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