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Fig. 4

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CMD and luminosity function for the m1m10 field. This figure illustrates the procedure used to obtain magnitude limits for the RC members. The strip of stars between the red lines, following the giant sequence in the CMD, is used to construct the histogram in the right panel. The green horizontal lines mark the adopted limits for the RC, while the dotted lines mark the position of the peaks detected in the distribution. We use the estimated limits to select bona fide RC stars in the respective spectroscopic samples, and also to explore the double RC morphology in Sect. 7. Note that unlike the CMDs presented in Fig. 2, this contains only VVV photometry that saturates at Ks = 12 mag. The RC region is fainter than this limit.

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