Fig. 5

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Flux density spectral index. Left: map of the spectral index computed from the ALMA continuum images at 0.9 mm, 1.3 mm, 2.1 mm, 2.8 mm and 3.2mm with a matching beam of 0.″095 × 0.″065 and position angle of 61.24°. Right: radial profile of the spectral index in the northwest and southeast sides (blue and red curve, respectively), error bars are shown for each bin and calculated as described in the text. Overplotted with dashed lines is the corresponding flux density profiles in Band 4 (right y axis). The grey shaded region on the left denotes the angular resolution of the map as half of the average beam FWHM.
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