Histogram of radii (dilution factors C_k, directly related to radius because the distance is known) derived from the comparison of the most frequent best-fitting solution for each Monte-Carlo simulation of the SED of GJ 758 B. The hatched areas correspond to the range of radii predicted for the estimated T_eff and age of the system by the Saumon & Marley (2008) models with cloudy (blue hatches), hybrid clouds (red hatches), and cloudless (green hatches; covering [M / H] of 0, 0.3, and –0.3 dex) atmospheres, considered as boundary conditions. The shaded zone correspond to the predictions of the COND models (Baraffe et al. 2003).