[O/Fe] vs. [Na/Fe]. Filled yellow circles are our data for NGC 6528, filled blue triangles: NGC 6440 (Muñoz et al. 2017), filled red triangles: NGC6441 (Gratton et al. 2006, 2007), filled dark green triangles: NGC 6553 (Tang et al. 2017), filled magenta triangles: HP1 (Barbuy et al. 2016), filled green square: Galactic GCs from Carretta et al. (2009a).
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