Age-metallicity relation inside 3.4°. The red circles and blue triangles show clusters corresponding to the metal-rich and metal-poor groups, respectively. The six clusters studied in this work are represented with filled symbols. The references for the AMR models are the same as in Fig. 12. The cluster HW41 has been plotted within a rectangle that represents the range of ages that can be found in the literature for this cluster (see text for details).