[O/Fe] versus [Fe/H] for the Feh-Duf star (black circle), disk stars (blue circles), CEMP-s stars (red circles), and CEMP-no stars (green triangles). Abundance data for disk stars are from Edvardsson et al. (1993) and Nissen et al. (2002). Abundance data for CEMP-no stars are from Cayrel et al. (2004) and from Masseron et al. (2010) and abundance data for CEMP-s stars are from Masseron et al. (2010).
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