Relationship between the age and the mass of the models that satisfies the observational constraints. The circles/diamonds correspond to the Y_i = 0.245 / 0.255 solution, and the red denotes the A_V = 0.10 mag solution. The crosses denote the values corresponding to the centres of the error boxes in the HR diagram (Fig. 8) and the solutions given in Table 12. See Sect. 7.3.4 for details.