Abundance ratios of S and Zn for DLAs (red triangles), Sculptor stars (blue circles) and other local dwarf galaxy stars (light blue pentagons). Average ages of Sculptor stars are listed at the top (blue) for each bin (de Boer et al. 2012). Error bars show the size of the bin (x) and the error of the mean (y). Mean trends of Milky Way stars are shown with gray lines: solid for the halo (dwarf and giant stars); dashed for the disk (dwarf stars). With the exception of Sculptor, a proxy for S is adopted for all dwarf galaxy stars: ). References: DLAs: Quiret et al. (2016); Dwarf galaxies: see Table 1; Milky Way halo: Cayrel et al. (2004), Nissen et al. (2004, 2007), and Spite et al. (2011); Milky Way disk: Reddy et al. (2003).