Stacked continuum-subtracted spectra (black lines) and CASSIS models (coloured lines) for the molecules detected in this work. Dashed lines mark the frequencies of the transitions as listed in Table 1 and the grey bar marks the ± 1σ error calculated from the line-free channels in each spectral window. Panels A and B: two weak CH₃OH lines 9_−5,4–9_−4,6 and 3_1,2 –4_2,2 with the 100 K CASSIS models at 5 × 10¹⁴ cm⁻¹ (blue) and 2 × 10¹⁵ cm⁻¹ (green). Panels C and D: best-fit models for the CH₃OCH₃ 20_1,20 –19_0,19 and 11_3,8–10_2,9 transitions and the CH₃OCHO 32_3,30 –31_3,29 and 32_3,30–31_2,29 transitions. In panel D the negative dip in the spectrum at ≈363.5 GHz may be an atmospheric absorption feature (https://almascience.eso.org/about-alma/atmosphere-model). Panels E and F: best-fit models for NO covering the 4₁–4₃ and 4₁ –4₄ transitions. Panels C, D, and E: CH₃OH model for the strong lines.