Fig. 5
Measurements of 16O/18O in water and carbon dioxide for several comets (for references see Table 3). The measurement of 16O/18O in CO2 shows a significantly smaller error bar than earlier measurements (black circle) and is within uncertainties compatible with a terrestrial abundance by Meija et al. (2016) (dotted line 16O/18O) but not with a solar abundance by McKeegan et al. (2011) of 530 (solid line).
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