The distribution of [Mg/Fe] for our sample of RGB stars in the Carina dSph as pink filled circles. Also included in the plot are the 5 RGB stars in the Carina dSph from Shetrone et al. (2003): pink open triangles; the 9 RGB stars from Venn et al. (2011): pink open squares and 6 of the RGB stars from Koch et al. (2008): pink open diamonds. Stars in Sculptor are in green crosses ((Shetrone et al. 2003; Geisler et al. 2005); Hill et al., in prep.). Milky Way halo stars are in small grey dots (from Venn et al. 2004, and references therein). Individual error bars are given for some peculiar stars and a representative error bar for the rest is given in bottom right hand corner.