Top panel: abundance comparisons with classical (Draco: triangles, Sextans: three-pointed asterisks, Ursa Minor: squares) and ultra-faint (Coma Berenices: pentagons, Hercules: stars, Ursa Major II: asterisks) dwarf galaxies from the literature (Aoki et al. 2009; Cohen & Huang 2009, 2010; Frebel et al. 2010; Koch et al. 2008). For comparison, the abundance data for MW halo giants extracted from the SAGA database (Suda et al. 2008) (R > 30   000 with no flags of “C-rich” nor of “CEMP”) and from Ishigaki et al. (2012) are plotted with crosses and dots, respectively. Bottom panels: mean [Mg/Fe] ratios for each galaxy plotted against velocity dispersion (σ_los, left) and luminosity (log   L(L_⊙), right) for that galaxy. The σ_los and L data are taken from Walker et al. (2009).