Surface plot of the results of a Monte-Carlo simulation of a comparison of the photometric measurements (M_Ks from NaCo and J − H from 2MASS) and evolutionary models by Baraffe et al. (1998) and Yi et al. (2001). Large probabilities are shown in dark colors and low probabilities are shown in light colors. The color bar on the right show the encoded probability. For the highest probability, the age and the mass are given in the corresponding subfigures. The datapoint shows the dynamical mass of HH Leo  B+C, divided by 2, and the gyrochronological age of HH Leo for comparison.