Maximum posterior (top) and posterior rms (bottom) CMB intensity maps derived from the joint baseline analysis of Planck, WMAP, and 408 MHz observations. The two circular regions close to the North Galactic Pole in the rms map correspond to the Coma and Virgo clusters, for which the thermal SZ efect is fitted together with the primary diffuse components. Note also that the rms map includes statistical errors alone, not modelling errors, and they are therefore only meaningful in regions where the corresponding χ² is acceptable; see Fig. 22. Both panels employ linear colour scales.