Fig. A.1
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C/S versus O/S for our stars (blue points) and those (in grey) analysed by Biazzo et al. (2022). Symbols as in Fig.7. Dashed lines represent the solar abundance ratios by Biazzo et al. (2022). The typical uncertainty was estimated referring to the methodology used by Delgado Mena et al. (2010) and it is represented on the top left corner of the plot.
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