Element abundances for ET0097 (red pentagons), Sculptor (blue circles) and the Galactic halo (gray squares). Sculptor abundances are averaged over all stars with −2.35 ≤ [ Fe/H ] ≤ −1.75. For Sculptor, most elements come from Hill et al. (in prep.). Exceptions are C and N estimated here from CN molecular lines (see Fig. 6 for detail), and S which comes from Skúladóttir et al. (in prep.). The Galactic halo abundances are averaged over stars with −3.0 ≤ [ Fe/H ] ≤ −2.0. Abundance averages for C and N in the Galactic halo are taken from mixed, C-normal stars in Spite et al. (2005). Other elements up to Zn are taken from Cayrel et al. (2004), with the exceptions of S, which is from Spite et al. (2011), and Cu, which is taken from both halo and disk stars in Mishenina et al. (2002). Elements heavier than Zn come from François et al. (2007). Error bars for Sculptor and the Galactic halo represent 1σ of the scatter of [X/Fe] over each sample. No NLTE corrections have been applied, but are expected to be similar for all stars.