recover the large scale structure (see §\[sec:continuum\] below). The total number of 12m antennas varied between 41 and 42, with baselines ranging from 41 to 312 m (5th and 95th percentiles). The correlator was set up with four spectral windows centered at 253.60, 255.60, 269.61 and 271.61 GHz with 2 GHz bandwidths and 15.625 MHz spectral resolution. The four are used together to study the dust continuum emission only. The weather also varied between the multiple band 6 observations, with PWV values of 0.89, 0.33, 0.30, 0.82 and 1.56 mm. Despite these variations we decided to use all the data sets to obtain the highest possible S/N. Calibrations were applied using the pipeline provided by ALMA and CASA 4.7. The total time on source for band 6 was 236 min, and 184 min for band 7 (49 and 135 min for the 12m array and ACA, respectively). Below we present the image analysis of continuum and line observations.

Continuum {#sec:continuum}
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Continuum maps at band 6 and 7 are created using the <span style="font-variant:small-caps;">clean</span> task in CASA 4.7 [@casa] and are presented in Figure \[fig:almab6b7\]. We adopt natural weighting for band 6 and 7 (12m+ACA combined) for a higher signal 