Total flux of the ¹²CO J = 3–2 (left) and ¹³CO J = 3–2 (middle) emission from the ALMA-ACA data (red) and the combined (ACA+TP) data (black). The spectra were generated by convolving the images with the APEX beam (FWHM = 18″). The ¹²CO J = 3–2 spectrum (Ramstedt et al. 2006) from APEX (FWHM = 18″) is plotted for comparison. Owing to the artificial feature (explained in Sect. 3.2) in the blueshifted wing of the ¹³CO J = 3–2 line, the line profile of the combined data was only plotted from –35 km s^-1. The ¹²CO J = 2–1 spectrum (right) from the SMA observation (Chiu et al. 2006) was generated by convolving the image with the SMA primary beam of 55″.