As in Fig. 5, but with symbols colour-coded according to age. The size of the symbols is proportional to the number of stars studied in the cluster to obtain the mean value reported here. The open diamond represents ASCC 123 from Frasca et al. (2019). Left panel: all the clusters younger than 300 Myr, middle and right panels: fit without clusters younger than 100 Myr and 200 Myr, respectively. The fit to the models is quite reasonable when considering clusters older than 200 Myr.