(5th and 95th percentiles), and between 9 to 11 ACA 7m antennas with baselines ranging from 9 to 44 m. The correlator was set up with two spectral windows centered at 343.13 and 357.04 GHz with 2 GHz bandwidths and 15.625 MHz spectral resolution, and the other two centered at 345.03 and 355.14 GHz with 1.875 GHz bandwidths and 0.976 MHz spectral resolution. The four windows are used together to study the dust continuum emission, while the latter two are also used specifically to search for line emission from CO and HCN molecules in the disc (see §\[sec:gas\]). The weather varied between the multiple ACA band 7 observations, with average PWV values of 0.38, 0.72, 0.89 and 1.2 mm. The average PWV during the single 12m observation was 0.56 mm.

Band 6 observations were carried out in April 2017 (see Table \[tab:obs\]) using the 12m array only. We requested observations using two different 12m antenna configurations to recover well the large scale structure and, at the same time, achieve high spatial resolution, but due to time constraints the compact configuration observations were never carried out. We find however that the observations with the extended configuration have baselines short enough to 