Multiple-shell radiative-transfer model fit to the radial intensity profile at a PA of 325° in the 100 μm image. Bottom panel: the black line shows the deconvolved observations, the red dotted line shows the predicted continuum intensity based on Eq. (1), and the green full line shows the multiple shell fit to the data based on Eq. (1) using the fractional density variations shown in the upper panel. Upper panel: relative density change f(r) in each arc. The profile was not fitted for r < 15′′, because of the complex PSF structure in this region.
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