Planck 2015 results
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Fig. 22


Top: χ2 per pixel for joint baseline Planck, WMAP, and 408 MHz intensity analysis. Middle: confidence mask derived by smoothing the χ2 map to 1deg FWHM, and thresholding at a value of . Its primary application is for the low- 2015 Planck temperature likelihood, and it is accordingly denoted LM93 (93% likelihood mask); see Planck Collaboration XI (2016) for further details. Bottom: histogram of χ2 values outside the conservative PM61 mask. The grey dashed line shows the best-fit χ2 distribution with a variable degree of freedom and scaling, used to account for prior and noise modelling effects; see Sect. 5.3 for further discussion.

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