Planck 2018 results
Free Access

Fig. 2.


Sky polarization in seven polarized frequency bands of Planck. The first two columns show the Q and U Stokes parameters; the last column indicates the polarized intensity, (although this emphasizes the strength of polarization in noisy regions). In addition to the rich science that they enable on their own, these maps set the baseline for all future CMB polarization experiments, for example by defining the most cosmologically challenged areas.

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