Observed profiles of the mm- and submm-wave transitions (black), Sect. 2. We also show (red points) our best-fit model predictions from a rotating disk, which adequately reproduces the line cores, but underestimates the line-wing emission of some lines (green arrows), see Sect. 4. The values of the free scale parameter in the model predictions that account for uncertainties in the calibration are indicated in the upper-right corners.