Thermal dust polarization fraction for Galactic emission zero-level corrections of 0 μK (top) and 34 μK (bottom). A value of 34 μK corresponds to our current best estimate of the residual zodiacal light offset in the 353 GHz channel (Planck Collaboration VIII 2016). The statistical uncertainty on the Galactic emission zero-level from H i cross-correlation is 0.0067 MJy sr-1 or 23μKCMB.
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