Fig. 2.
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Spectral fits of CH3CN 60–50 and 61–51 in R1 (all regions in Fig. A.2) Orange and blue curves represent the main peaks (at vsys ± 1 km s−1) and the redshifted (+3–4 km s−1 from vsys) components, respectively. Red curves show the total fit. Dashed vertical line marks the systemic velocity, +8.5 km s−1 (Lee et al. 2014). Purple ticks indicate transition frequencies from Table 1.
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