Planck 2018 results
Open Access

Fig. 23.


Foreground-cleaned 70 GHz maps of the Stokes parameters Q (top) and U (bottom) on 62.4% of the sky (mask R1.8x). In order to highlight the largest angular scales relevant for the low- likelihood, these maps have been smoothed with a Gaussian filter of FWHM  =  10°. As a reference, for τ ≈ 0.06 the expected range for the signal is ±0.4 μK.

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