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Fig. 1

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SOFIA/HAWC+ polarization maps of HL Tau in band A (53 μm, top left), band C (89 μm, top right), band D (155 μm, bottom left), and band E (216 μm, bottom right). The surface brightness (gray scale) is given in units of Jy arcsec−2 and is overlaid with polarization vectors in orange. The length and orientation of the vectors give the degree and angle of polarization, respectively. Only vectors that satisfy the selection criteria (4) are shown. The beam size (FWHM) at each corresponding SOFIA/HAWC+ wavelength band is indicated in the respective lower right corner. The scale bar (1000 au) corresponds to an assumed distance of HL Tau of 140 pc. The images are cropped to an image size of 2 arcmin × 2 arcmin. See Sect. 3.1 for details.

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