Fig. 5
CMDs in δ4, y0 (see text for the definition of δ4). Blue symbols indicate P stars and red symbols IE stars (light blue and magenta for NGC 6205 (=M 13) and NGC 6341 (=M 92)). As in Fig. 1, for NGC 6397 we also show the results from Lind et al. (2009, 2011); the separation between Na-poor (light blue) and Na-rich (magenta) stars seems cleaner, due to the better data quality and the smaller sample.
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