[O/Fe], [Mg/Fe], [Si/Fe], [Ca/Fe], [Ti/Fe] vs. [Fe/H]. Filled yellow circles indicate our data for NGC 6528, filled blue triangles: NGC 6440 (Muñoz et al. 2017), filled red triangles: NGC 6441 (Gratton et al. 2006, 2007), filled purple triangles: Terzan 5 (Origlia et al. 2011, 2013), filled dark green triangles: NGC 6553 (Tang et al. 2017), filled magenta triangles: HP1 (Barbuy et al. 2016), filled orange triangles: bulge field stars (Gonzalez et al. 2012), filled gray triangles: halo and disk fields stars (Venn et al. 2004).
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