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Fig. 4.
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Sky masks used for HiLLiPoP V4.2 as a combination of a Galactic mask (blue, green, and red for the 100, 143, and 217 GHz channel, respectively), a CO mask, a point-source mask, and a mask removing nearby galaxies. The effective sky fractions remaining at 100, 143 and 217 GHz are 75%, 66%, and 52%, respectively.
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