Fig. 4
Upper panel: observed CMD of the HB region of the Carina dSph from B10. Red crosses mark the position of RR Lyrae stars. The red boxes are those chosen for detailed comparison. The solid black line represents the ZAHB, extending up to a mass of 1.45 M⊙ for a metallicity of Z = 0.0001. Lower panel: the synthetic HB for Carina. The red, blue, and green dots mark stars with ages t> 7 Gyr, 4 Gyr <t< 7 Gyr, and t< 4 Gyr respectively.
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