Average on-nucleus spectra of the ortho H2CO(312–211) line at 225.698 GHz (left panel) and para H2CO(303–202) line at 218.222 GHz (right panel) in comet C/2016 R2 (PanSTARRS) obtained with the IRAM 30 m telescope on 23.81 and 24.78 January 2018, respectively. Scales as in Fig. 3.
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