Fig. 4.
Panel a: I vs. V − I CMD of decontaminated RGB stars (black dots). Selected zones for the bRGB and rRGB stars are outlined in blue and red, respectively. Panel b: RGB stars with available spectroscopic measurements (Kirby et al. 2017) colour-coded by their [Fe/H] values. Selected zones (same as in panel a) for bRGB and rRGB stars are outlined with black lines.
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