Fig. 3

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Individual lines observed with IRAM-30m in comet C/2021 A1 during 8–13 December 2021 (weighted averages). 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 line. The position and relative intensity of the hyperfine components of the HCN(3–2) line have been drawn below the line.
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