Average on-nucleus (offset 1.7′′) spectrum of the CO(2–1) line at 230.538 GHz obtained with the IRAM 30 m telescope on 24.80 January 2018. The vertical scale is the main beam brightness temperature and the horizontalscale is the Doppler velocity in the comet rest frame. The simulated profile with QCO = 5 × 1028 molec s−1 in a 0–60° cone at vexp = 0.56 km s−1 and QCO = 5.5 × 1028 molec s−1 in a 60–120° cone at vexp = 0.50 km s−1 is superimposed in green dotted line.
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