Fig. 5
Series of methanol lines around 242 GHz from comet C/2016 R2 (PanSTARRS) obtained with the IRAM 30 m telescope on 23.8 January 2018. The inferred rotational temperature is Trot (242GHz) = 18 ± 2 K. The vertical scale is the main beam brightness temperature and the horizontal scale is the Doppler velocity in the comet rest frame (lower axis) or the rest frequency (upper axis).
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