Fig. 1
Monitoring of the HCN J = 3–2 line on ISON and Lovejoy during Nov. 13.4–16.4 UT. Lines are shifted in velocity by multiple integers of 10 km s-1 and in Tmb by 2 K for a better visualization. The line intensity shows strong time variations in ISON but remains nearly constant from Nov. 13.4 to 16.4 UT in Lovejoy.
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