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Fig. 6

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Individual lines observed with IRAM-30m in comet C/2022 E3 during 3–6 February 2023 (average intensity, excluding offset positions). 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 line. A galactic contamination of CO has been blanked out. The position and relative intensity of the hyperfine components of the HCN(3–2), HCN(2–1), and H13CN(3–2) lines have been drawn below the lines.

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