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Fig. 1

image

Orientation of polarization measurements in Planck. The two left panels show, for an actual Planck detector, the maps of ⟨cos2α and ⟨sin2α respectively, where α is the direction of the polarizer with respect to the local Galactic meridian, which contributes to the spin 2 term defined in Eq. (A.3). The right panel shows the power spectrum of , multiplied by ( + 1)/2π.

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