Fig. 3
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CO J(2−1) line observed in comet 29P with the IRAM 30 m telescope, from 2007 to 2021. Channels corresponding to the CO line from Earth’s mesosphere (2007 spectrum obtained in FSW mode) and CO galactic lines (the 2021 spectrum includes data in PSW mode) are blanked. The velocity scale is in the comet rest frame. The spectral resolution is 51 m s−1.
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