Planckf_sky ≈ 60% Galactic mask in yellow and WMAP KQ75 at N_side = 1024 in red. The mask used for comparative spectral analysis of the Planck 70, 100, and 143 GHz, and WMAP nine-year V- and W-band sky maps is the union of the two. The joint Planck 70, 100, and 143 GHz point source mask is also used, exactly as before. The final sky fraction is f_sky = 56.7%. The Planck mask is degraded to the pixel resolution N_side = 1024, at which the yearly WMAP individual differential assembly maps are available.