Qualitative analysis of the effect of extended emission on the ALMA Cycle 0 observations of ALMA. The left columns shows toy-models of the emission from the shell around R Scl and extended emission inside the shell at the for the ¹²CO(1−0), ¹²CO(2−1), and ¹²CO(3−2) transitions (top to bottom, respectively). The right column shows the resulting simulated observations using the ALMA Cycle 0 compact configuration of the main array (simulated using the CASA simulator).