AL 3 V vs. V − I CMD. The black dots are the stars within 120 pixels from the cluster centre (see Ortolani et al. 2006). The red stars are the observed stars of the present work. The solid blue line represents the median solution of the isochrone fitting, while the blue region reveals the solutions within 1 − σ from Dartmouth isochrones, and the rose region corresponds to BaSTI solutions for the AGB.