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Fig. A.4

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CH3CN series of lines at 147, 165, 220, and 257 GHz observed with IRAM-30m in comet C/2022 E3 on 3–6 February 2023 (average intensity). The vertical axis is main beam brightness temperature in K. The horizontal axis is the Doppler velocity in the rest frame of the comet with respect to the main line, with frequencies in the rest frame of the comet given on the upper axis.

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