Derived LTE abundances of [Mg/Fe] over metallicities for individual dSph galaxies ordered by decreasing magnitude. Bottom panel: remaining dSph and UFD galaxies. Green triangles indicate stars of the globular cluster Terzan 7. Gray dots show MW stars of Gratton & Sneden (1988), Edvardsson et al. (1993), McWilliam et al. (1995b), Ryan et al. (1996), Nissen et al. (1997), Hanson et al. (1998), Prochaska et al. (2000), Fulbright (2000), Stephens & Boesgaard (2002), Ivans et al. (2003), Bensby et al. (2003), and Reddy et al. (2003). All stars where the parallax differs significantly from the distance to the host galaxy are marked with red symbols. Stars with an error of [Mg/H] >  0.4 are indicated with open symbols. The reduced chi-square of the least-square fit (Sect. 6.1) is given in the upper right corner of each panel. The median error for each galaxy is denoted in the lower right corner of each panel.