Representing the "butterfly" projection in FITS - projection code XPH
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🌌 astro-ph.IM
astro-ph.CO
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projectionbutterflyfitsarticlecodeconstructedformaliseshealpix
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The "butterfly" projection is constructed as the polar layout of the HEALPix projection with (H,K) = (4,3). This short article formalises its representation in FITS.
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