Fig. 4.
Panel a: comparison between the upper limit for 2I (red data point) and Q(C2)/Q(CN) from the Osip et al. (2003) database for a variety of comets with different Q(CN). Full symbols represent typical comets and open symbols represent carbon-chain depleted comets as defined in A’Hearn et al. (1995). Error bars are omitted for clarity. Panel b: same as panel a but for Q(C3)/Q(CN).
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