NLTE-corrected values of [S/Fe] for the target stars in Sculptor (blue circles). Filled squares show NLTE sulphur measurements from multiplet 1 in Galactic halo stars taken from Nissen et al. (2007; light grey) and Spite et al. (2011; dark grey). Sulphur abundances in halo stars determined from multiplet 3 are shown with pluses (Takeda & Takada-Hidai 2012), asterisks (Jönsson et al. 2011), and exes (Caffau et al. 2010). In all cases, NLTE corrections have been applied. Milky Way disc stars from Chen et al. (2002) are shown with open grey squares. The disc stars have not been corrected for NLTE effects, but these sulphur abundances are measured with lines that are not believed to be sensitive to NLTE effects, so any corrections applied would be small (and negative). No 3D corrections have been applied to any of the data, but are expected to be positive for both multiplet 1 and 3. A representative error bar for the Sculptor data is shown.
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