Comparison of the data with the best-fit model in the CMD (left panels) and in the lithium–T_eff plane (right panels) for Gamma Vel A (top) and Gamma Vel B (bottom). Errors on photometry are smaller than the symbol size. Open downward triangles in the lithium diagrams represent upper limits for A(Li). The best-fit model with α_ML = 1.0 and β_spot = 0.2 is shown as a solid blue line, and the isochrones corresponding to the maximum and minimum age derived by the fitting method are shown as dashed and dot-dashed red lines, respectively. The long-dashed green line is the isochrone at the same age, reddening, and α_ML as the best-fit model, but with β_spot = 0.