Planck 2018 results
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Fig. 7.


30 GHz polarization amplitude null maps evaluated between survey combinations {S1,S3, S5–8} and {S2, S4} for both the 2015 (top) and 2018 (bottom) calibration schemes. This particular survey split is maximally sensitive to residual gain uncertainties from polarized Galactic foreground contamination because of the orientation of the scanning strategy employed in Surveys 2 and 4; see text and Planck Collaboration II (2016) for further details. Both maps are smoothed to an effective angular resolution of 8° FWHM.

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