Planck 2018 results
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Fig. 9.


Masks recommended for analysis of the cleaned CMB maps. Top panel: common confidence masks for temperature (left) and polarization (right). These masks should always be applied to any scientific analysis of the maps presented in this paper. Bottom panel: unobserved pixel masks for half-mission (left) and odd-even (right) data splits. These panels show the products of the individual unobserved pixel masks for temperature and polarization, whereas separate (but very similar) temperature and polarization masks are applied during analysis.

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