Fig. 35
Left panel: 5 Gyr stellar isochrones with different metallicities overlaid on the CMD Ks vs. J − Ks. Right panel: comparison of the real data in the CMD Ks vs. J − Ks with asynthetic stellar model produced using the code of Aparicio & Gallart (2004), a metallicity of 2.5 solar metallicity, and a constant stellar formation between 1 Gyr <t < 5 Gyr (blue circles)and 5 Gyr < t < 12 Gyr (red diamonds).
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