[O/Fe] vs. [Na/Fe]. Filled blue circles are our data for NGC 6440, filled red triangles are NGC 6441 (Gratton et al. 2006, 2007), filled dark green triangles are NGC 6553 (Tang et al. 2017), filled magenta triangles are HP1 (Barbuy et al. 2016), and filled green squares are Galactic GCs from Carretta et al. (2009c).
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