Fig. 9.
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[Mg/Fe] vs. [Fe/H] for the UFDs with luminosities larger than 104 L⊙, for the models (in blue) and the observations (in gray). Contours, in black for the models and in red for the observations, represent the regions encompassing 30, 60, and 90% of the stars. The data contain a total of 19 stars from Bootes I (Gilmore et al. 2013; Feltzing et al. 2009; Norris et al. 2010b; Ishigaki et al. 2014) and Hercules (Koch et al. 2008; Vargas et al. 2013; François et al. 2016).
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