Fig. 11

Logarithm of ratio of C2 to OH production rates as function of logarithm of ratio of CN to OH for 66P (red star) compared to JFCs (filled circles) and long-period comets (crosses) observed with TRAPPIST between 2010 and 2016 (Opitom 2016), and also with typical (green filled squares) and carbon-chain depleted (green opened squares) comets given in A’Hearn et al. (1995).
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