Fig. 2

Left panels: C and O yields of massive stars as a function of the progenitor mass predicted by three theoretical models (circles: Woosley & Weaver 1995; triangles: Nomoto et al. 1997; squares: Ekström et al. 2008). Right panel: theoretical nucleosynthesis [C/O] ratio predicted by the three models as a function of the progenitor mass.
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