Integrated-light abundances of α-elements relative to iron (Table C.1). Large symbols show our measurements, with symbol colours and shapes encoding information about the host galaxies as indicated in the legend. Error bars indicate σ_⟨X⟩ or S_X, whichever is larger. Olive coloured small triangles: NLTE measurements for Milky Way field stars (Bergemann et al. 2017b; Mashonkina et al. 2017b, 2019; Mishenina et al. 2017; Zhao et al. 2016). Orange points: Milky Way bulge stars (Bensby et al. 2017). Grey points in panel with [Si/Fe]: LTE measurements for Milky Way field stars (Suda et al. 2008).