Fig. 5
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Spectrum of a series of CH3CN lines around 147 GHz on 25–27 July 2020 in the comet C/2020 F3 (NEOWISE) with IRAM 30-m. The vertical scale is the main beam brightness temperature and the horizontal scale is the Doppler velocity in the comet rest frame with respect to the (8,0)–(7,0) line. The frequency scale is also provided on the upper axis.
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