Discs with one (OSP, Table 2) and two (Model II, Table 3) components as seen by different telescopes. Top panels: unconvolved discs at 870 μm and 1.1 mm (left- and right-hand side of each splitted image). Units are Jy/pixel, where 1 pixel = 0.2′′ × 0.2′′. Middle panels; simulated LMT/AzTEC images that were generated by convolving the models at 1.1 mm with a Gaussian (FWHM = 6′′). The white circle in the lower right of the left image illustrates the beam size. The contours in each image represent 2σ, 3σ, 4σ, and 5σ levels. Bottom panels: synthetic ALMA images in Band 7 (central wavelength 870 μm), using antenna configuration alma.out01 and a water vapour overburden of 0.1 mm. The beam size is 1.1′′ × 0.9′′. With an on-source integration time of 15 h a sensitivity of ≈10μJy/beam was achieved.
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