Fig. 1
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Assessment of the data quality. Top: S/N of the polarization. Colour scale shows log10 (p∕σp). Bottom: dispersion of the polarization angle σψ in degrees. Both are estimated using Bayesian analysis of the Planck data. Contours correspond to the value of 2 K km s−1 of the 12CO integrated intensity, represented in the right panel of Fig. 3.
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