Composite spectrum of the LMC bar field used in the integrated stellar population analysis. Top row: the spectrum is divided according to the four different grisms used: Blue for grism # 7 (3500–5185 Å), green for grism # 9 (4725–6730 Å), red for grism # 10 (6275–8160 Å), and black for grism # 15 (7565–8745). For each grism the corresponding sky spectrum, i.e. the spectrum taken in the sky field, has been subtracted. Only the LMC bar contribution is shown here. Bottom row: fully reduced composite spectrum of the LMC bar (black) and fully reduced, emission-cleaned composite spectrum (red). For the stellar content analysis we use the wavelength range from 3800 to 6800 Å (dashed vertical red lines; see text for details). The shaded regions of the spectrum are the masked regions (not considered in the fit).