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Fig. 13

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C/O ratio versus [Fe/H] for thin-disk stars. Stars proven to have planets (see Table 4) are plotted with filled (blue) circles. In the upper panel, O abundances have been determined from the O i triplet and in the lower panel from the [O i] λ6300 line. The lines show the relations in Eqs. (2) and (3), respectively

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