Fig. 3
[C/O] ratios as a function of [Fe/H] for the whole sample of solar twins. The symbols are the same as in Fig. 1, where the empty circle corresponds to the HD 112257 star. The linear relation between the [C/O] ratios and [Fe/H] fitted by N15 is plotted as a dashed line, while the grey band represents the one-sigma dispersion around the fit using the data set of Takeda & Honda (2005). The star with the anomalously low C abundance is HD 43162.
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