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Fig. 4


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Top: HCN 1–0 spectrum towards the comet 46P/Wirtanen on 20 December 2018. The positions, corresponding to a frequency throw of 7 MHz, of the negative artifacts of the HCN lines have been marked with negative dashed red lines. Bottom: global average of all high-resolution (0.1 km s−1) HCN data observed from 20 December 2018 to 18 January 2019. Scales are as in Fig. 1.

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