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Fig. 4.
NiI/FeI abundance ratio against the C2H6/H2O ratio. The C2H6/H2O ratios are from Dello Russo et al. (2016) except for the C2H6/H2O ratios for comets 21P/Giacobini-Zinner and 46P, which are from Roth et al. (2020, 2021). Colors represent the comet types as in Fig. 2.
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