Upper panel: Spectrum extracted for HR 2562 B (green squares) with its error bars. The colored solid lines represents the three best fitting spectra from the BT-Settl synthetic spectra. The orange square is obtained from the corresponding spectrum calculating the flux on the IRDIS H broadband filter in order to better compare it with the IRDIS data.The same operation was not done for the other spectra to avoid confusion in the final plot. Lower panel: Same as upper panel, but using synthetic spectra with poorer fits.