Results obtained by considering L_acc values from three different empirical relationships for Brγ: Alcalá et al. (2014; green), Muzerolle et al. (1998; red), and Calvet et al. (2004; blue). Displayed plots are L_acc versus L_∗ (top), Ṁ_acc versus M_∗ (centre), and Ṁ_acc normalised to M_∗² versus age (bottom). In the last plot we report the curves of the viscous disk model of Hartmann et al. (1998) shown in Figs. 6 and 7; the best-fit power-law indexes obtained from the different distributions for sources with Log t> 5.9 (see text for details) are also indicated.