Comparison between Mg I EW measurements for stars with double measurements for the Sextans, Sculptor, and Fornax dSphs (59, 137, 289 stars, respectively). The figure shows the distribution of Mg I EW differences from integrated flux as a function of S/N for the stars with S/N per Å ≥ 10 and estimated error in velocity ≤ 5 km s-1 for each measurement. The solid lines indicate the 1-σ region for the error in the difference of EW; the dashed lines show the relation used in Battaglia et al. (2011). The asterisks indicate the median ΔEWint,MgI per S/N bin, with the scaled m.a.d. shown as error bar.
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