Fig. 1. Observed CMD of Leo I. A distance modulus (m-M)₀ = 22.18 and reddening E(B-V) = 0.02 (Lee et al. 1993) have been used to transform to absolute magnitudes and unreddened colors.
Fig. 2. Synthetic CMD with a constant star formation rate from 15 Gyr ago to the present and Z = 0.0004. Different gray scales represent the different partial models. The regions used to compare the observed and model CMDs are shown

Fig. 3. SFH obtained for Leo I under the assumption of a Kroupa et al. (1993) IMF and constant Z = 0.0004.
Fig. 4. Best model CMD computed with the SFH in Fig. 3