Observed spectra in the 112 GHz band. The intensity scale is in , not corrected for main beam efficiency. The region marked with (1 / 10) around the CO 1–0 line was scaled down by a factor 10. The main molecular transitions are labelled regardless of line detection. Transitions of vibrationally excited HC₃N are labelled as v₇1e and v₇1f. The frequency scale is the observed frequency, not corrected for redshift.