Fig. 6
Top: [Na/Fe] vs. [Fe/H] for BL Her stars (open circles) and W Vir stars (filled circles) from Maas et al. (2007). HQ Car and DD Vel are overplotted in red and blue, respectively. The ratio for a representative thick-disc star at [Fe/H] = −0.5 dex is shown as a dashed line. Bottom: same for [Na/Zn] vs. [Zn/H]. Abundances have been rescaled to the solar abundances of Reddy et al. (2003), used as a reference by Maas et al. (2007).
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