Procedure adopted to obtain the reference theoretical models for NGC 6362. Panel a: three isochrones of 12.5 Gyr, for [Fe/H] = −1.07, [α/Fe] = 0.4 and different helium content. The red isochrone with Y = 0.2526 (helium-enriched by ΔY = 0.003) is obtained interpolating the isochrone with primordial helium, Y_p = 0.2496 (green), with the Y = 0.33 helium-enriched one (blue). Panel b: difference in color among the MSTOs, from which the δc_TO is calculated. The green isochrone is the same as in panel a and represents POPa. The purple and cyan isochrones have the same chemical content as the red isochrone of panel a, but are 11 Gyr and 10 Gyr, respectively. The corresponding δc_TO of each case is a horizontal line. The theoretical model δc_TO vs. ΔAge for NGC 6362 is shown in panel c. The purple and cyan points indicate the theoretical model values as obtained from the cases of panel b.