(Top panel, black continuous lines) GOG simulations of spectra contained in the Legget compilation corresponding to 2MASS0345 + 25 (left) and SDSS1511 + 06 (right) for G = 20 and 70 transits. The blue line represents in both panels the model corresponding to the mode of the posterior probability as derived using ellipsoidal sampling. In orange, the model that corresponds to the effective temperature derived from the spectral type (L1 and T0 respectively) using the SLC calibration. The lower row shows the original spectra completed with the best χ² model.