Comparison of models with observations in σ Orionis in various CMDs (VISTA filters). Isochrones of 1 Myr and 10 Myr are displayed for various sets of models: present models (red): solid (1 Myr) and dash-dot (10 Myr). BCAH98 models with (black): long dashed (1 Myr) and dot (10 Myr). The data (blue dots) are from Peña Ramírez et al. (2012) using a distance modulus of 7.73 (i.e. a distance of 352 pc). The hydrogen-burning limit (M = 0.07 M_⊙) is located at M_J ~ 6 (T_eff ~ 2900 K, log g ~ 3.5) at 1 Myr and M_J ~ 8 (T_eff ~ 2950 K, log g ~ 4.2) at 10 Myr.