[Na/Fe] as a function of [Fe/H] for stars in Sculptor and the Milky Way. The blue circles are Sculptor stars from this work, GIRAFFE (filled) and UVES (open). Representative error bars for the GIRAFFE data is shown in blue (bottom right corner). Magenta open diamonds are previously published Sculptor stars, and the Milky Way is shown with small black squares. References: Sculptor: Shetrone et al. (2003), Geisler et al. (2005), Frebel et al. (2010), Starkenburg et al. (2013), Skúladóttir et al. (2015a), Simon et al. (2015), Jablonka et al. (2015). Milky Way: Venn et al. (2004) compilation; Nissen & Schuster (2010).
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