Left: a) south polar region of the CMB-nulled 28.4 GHz map. Overplotted circles are the positions of 30-GHz sources from the second Planck Catalogue of Compact Sources (PCCS2, Planck Collaboration XXVI 2016). The 90% completeness limit for the catalogue (426 mJy) corresponds to a peak brightness of ΔT ≈ 50 μK at the 1° resolution of this map. Right: b) same region in a CMB-nulled version of the WMAP K-band map (22.8 GHz). The diffuse arc in the range 30° < l < 150° is part of Loop II. The colour scales are linear here.
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