Best fits of TWA 26 (in black) by BT-SETTL15 models (in blue) using different portions of the spectrum for the fit (shaded yellow rectangles). We define the fitting zones as follows: J = 1.0−1.32 μm ; H = 1.5−1.8 μm ; K = 2.0−2.48 μm. We perform the following fits: (a) J + H + K; (b) J; (c) H; (d) K; (e) J + H + K with Av as a free parameter; (f) the optical part (0.56−1.00 μm) of the flux-continuum and v sin (i) as a free parameter; and (g) examples of lines fitted on the flux-continuum.