Broad-band flux-calibrated X-Shooter spectrum of DENIS 1048-3956. The spectra from the three X-Shooter arms are shown in different colors. Published photometry from the literature is overplotted. The 2 MASS JHK_S magnitudes are shown with a slightly different color to distinguish them from the DENIS JK_S photometry given by Delfosse et al. (2001). At the blue end, the spectrum is dominated by noise caused by the intrinsic faintness of DENIS 1048-3956. Telluric absorptions are clearly visible especially in the NIR spectrum.