Effect of adopting different values of α_ML and of different spot coverage fractions on the models at 15 Myr (left panels), 30 Myr (middle panels), and 100 Myr (right panels). The top row shows the effect on the CMD, and the bottom row presents the effect on the surface lithium abundance as a function of T_eff. The standard reference model with α_ML = 2 and no spots is plotted as the solid black line. The dashed red and dot-dashed blue lines show the models without spots and α_ML = 1.5 and 1.0, respectively. The models with α_ML = 2 and β_spot = 0.2 and 0.4 are indicated with the dotted green and three-dot-dashed orange lines, respectively.