X-shooter spectrum of NGC 3783 simultaneously covering UV, optical, and NIR ranges. In each panel, the spectrum is shown with the full model that enables decomposition of the broad-line profiles overplotted, and the residual is shown underneath. The emission line components are also plotted separately. The gray-shaded regions in the residuals represent wavelength ranges of bad channels and features due to the poor telluric correction, which are masked in the fitting. Panel a: UV/optical spectrum with the Hα, Hβ, and Hγ lines. Panel b: part of the NIR spectrum used in this study, with the Paβ line. Panel c: [S II] doublet used as the narrow line template.