Isochrones and iso-mass curves predicted by different evolutionary models. Shown are the 10, 20, 50, 75, 150, and 600 Myr isochrones (dash-dotted lines, from top to bottom panels; except for the Pisa and DM97 models, that stop respectively at 100 and 500 Myr), while one iso-mass is drawn every 0.1 M_⊙ from 0.1 (left panels) to 1 M_⊙ (right panels). The 50, 75, and 150 Myr isochrones correspond to possible ages for AB Dor-MG, and are drawn in red. The blue shaded regions correspond to the observed values and the error bars for each component of system GJ 2060, A and B.