Fig. 2

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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 31,2 –42,2 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 201,20 –190,19 and 113,8–102,9 transitions and the CH3OCHO 323,30 –313,29 and 323,30–312,29 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.
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