Fig. 7
Observations of comet 21P with the IRAM 30-m in 2018: HCN(1–0) on 14.2–17.8 September, CS(3–2) and CH3 CN on 14.2–17.2 September and H2S(110 − 101) on 16.1–18.2 September UT. Scales as in Fig. 1. All the spectra are plotted with the same intensity scale and Doppler velocity range (40 km s−1). The rest frequency in MHz is provided on the upper axis of CH3CN lines.
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