Fig. 9.
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Same as Fig. 8, but for four more GCs. Upper left panel: 47 Tuc, with CN index from Smith (2015) and O, Na from Cordero et al. (2014). Upper right panel: M 13, with CN index from Smith & Briley (2006) and O, Na from Johnson & Pilachowski (2012). Lower left panel: M 4, with CN index from Smith & Briley (2005) and O, Na from Marino et al. (2008). Lower right panel: NGC 6752, with CN index from Smith (2007) and O, Na from Carretta et al. (2007).
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