Fig. 2

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Millimetre lines observed with IRAM-30m in comet C/2021 A1 during 12–16 November 2021 (average intensity). The CH3OH line is the sum of the J=1 to 4 J1 − J0 E lines at 165050.175, 165061.130, 165099.240, and 165190.475 MHz observed with the high resolution backend VESPA. The vertical axis is main beam brightness temperature in K and the horizontal axis is Doppler velocity in the rest frame of the comet with respect to the main line.
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