B−V vs. V−I and J−Ks vs. V−Ks colour–colour diagrams of RC stars (sample described in Sect. 2). The median metallicity of the sample is about −0.2. Padova Parsec 2.7 (left) and Dartmouth (right) isochrones with a median age of 2 Gyr are overplotted for three different metallicities: (green) [Fe/H] = + 0.5, (red) [Fe/H] = 0.0, and (blue) [Fe/H] = −0.5. Only the red giant branch and the early assymptotic giant branch are shown.
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