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Table 3:

Compilations of the solar chemical composition adopted in the computation of the EOS and gas opacities.
Reference $Z_{\odot}$ (C/O)$_{\odot }$ (C/O)a $_{{\rm crit},1}$
Anders & Grevesse 1989 (AG89) 0.0194 0.427 0.958
Grevesse & Noels 1993 (GN93) 0.0173 0.479 0.952
Grevesse & Sauval 1998 (GS98) 0.0170 0.490 0.947
Holweger 2001 (H01)b 0.0149 0.718 0.937
Lodders 2003 (L03) 0.0132 0.501 0.929
Grevesse et al. 2007 (GAS07) 0.0122 0.537 0.929
Caffau et al. 2009 (C09)c 0.0155 0.575 0.938

a This abundance ratio is defined by Eq. (35). b The elemental abundances are taken from Grevesse & Sauval (1998), but for C, N, O, Ne, Mg, Si, and Fe that are modified following the revision by Howeger (2001). c The elemental abundances are taken from Grevesse & Sauval (1998), but for N, O, and Ne following the revision by Caffau et al. (2008, 2009).
For each mixture the solar total metallicity $Z_{\odot}$ (in mass fraction), the abundance ratios (C/O)$_{\odot }$ and (C/O) $_{{\rm crit},1}$are indicated for comparison. The latter marks a critical boundary for the gas molecular chemistry in the range $3.2~\le~\log(T)~\le~3.6$. The C and O abundances are expressed as number fractions.

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