Observed visibilities in the central 100 m of the UV-plane for the SMA (left) and ALMA (middle) observations. Thanks to the subcompact configuration, the shortest spacings for the SMA are as small as 6-m. Right: visibility amplitudes versus radius for the merged ALMA+single dish observations. The 30-m telescope amplitudes (blue dots) have been scaled by a factor of 0.8 to match the ALMA ones (red dots) in the overlap region.
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