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Fig. 2

image

Real part of the visibilities at 689 GHz (~450 μm, Band 9) and at 336 Gz (~870 μm, Band 7) for SR 21 (top panel) and HD 135344B (bottom panel). The plot includes error bars that are of the size of the plotting points. At both wavelengths, the models with the best-fit parameters are over-plotted (solid line), which is the ring model in the case of SR 21, and the vortex model for HD 135344B.

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