Fig. 11
Logarithm of C2-to-CN ratio of 110 comets as a function of the Tisserand invariant parameter with respect to Jupiter (TJ). Filled symbols present typical comets, while the open symbols present the carbon-chain-depleted comets. Our measurement of comet 21P is represented by a blue diamond. The vertical dashed line at Tj = 2 separates the families of JFCs and Oort cloud comets.
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