Fig. A.1.
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Degree of polarization (P in %) computed using the GNILC 353GHz thermal dust map from Planck Collaboration IV (2020) at HEALPIX resolution, Nside = 2048. The location of our three sources (black dots) and Fairall 9 (black star) are indicated based on their galactic coordinates reported in Table A.1. The values for P for these sources are reported in Table A.2.
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