... CTQ 325

Based on observations obtained at the VLT Kueyen telescope (ESO, Paranal, Chile), the ESO programme 69.A-0123.

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...$] \simeq 0.15$

$[X/Y] \equiv \log\ (X/Y) - \log\ (X/Y) _\odot$. Throughout the text photospheric solar abundances for C and O are taken from Allende Prieto et al. (2001, 2002), and for Si from Holweger (2001).

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