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Table 1

Carbon and oxygen isotopic ratios.

Planet 12C/13C 16O/18O Reference

Earth 89.01 ± 0.38 498.71 ± 0.25 (1)
Venus 86 ± 12 500 ± 80 (2)
Venus 110 ± 30 537 ± 53 (3)

References. (1) Yung & DeMore 1999; (2) Bezard et al. 1987; (3) This work

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