Magnesium- and silicon-to-iron ratios as a function of [Fe/H] in Sculptor seen in orange, compared to the Milky Way halo stars in grey (Honda et al. 2004; Cayrel et al. 2004; Spite et al. 2005, 2006; Aoki et al. 2005, 2007; Cohen et al. 2013, 2006, 2004; Lai et al. 2008; Yong et al. 2013; Ishigaki et al. 2013). We distinguish the new Sculptor sample presented in this paper by large circles with error bars. These error bars add in quadrature the random and systematic uncertainties listed in Tables 2 and 5. The sample of Tafelmeyer et al. (2010) is shown with upright triangles, while the Starkenburg et al. (2013) stars, which were not re−observed at high resolution, are displayed with inverted triangles. The Frebel et al. (2010a) and Simon et al. (2015) stars are indicated by a star.