Fig. 23

Bailey diagram of NGC 6638 for I amplitudes, with RR0 and RR1 stars plotted as red circles and green squares, respectively. The black solid and dashed lines are the Oo I and Oo II loci, respectively, as calculated by Kunder et al. (2013) for I-band. The blue dotted line is the locus found by Arellano Ferro et al. (2011, 2013a) for the two Oo II clusters NGC 5024 and NGC 6333, respectively.
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