Best-fitting models to the J-band spectra of Luhman 16. The observations are shown in black, while the fiducial models are shown in orange and blue for Luhman 16A and B, respectively. The mean scaled uncertainties, defined as diag (${\tilde{s}}_i\sqrt{{\mathrm{\Sigma }}_{0,i}}$), are displayed to the right of the residuals for reference. The predominant absorption lines of FeH and H₂O are indicated in the upper panel. The fits to the other spectral orders can be found in Appendix C.