Maps with CMB, free-free, and thermal dust emission nulled, scaled so that a β = −3 power-law spectrum is unchanged in amplitude. a) Planck-only map (28.4, 44.1, 143, 353 GHz), scaled to 28.4 GHz. b) Combined Planck and WMAP. Weights used are given in Table 1. An asinh colour scale is used and an offset of 80 μKCMB has been subtracted to enhance the contrast.
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