Example of the multiple-line fit of WR features for the region found in NGC 3381. An almost horizontal blue line denotes the resulting continuum of the fit. The total fitted continuum plus emission lines on the blue bump is drawn with a thick red line. The nebular (blue) and broad stellar (green) components of the fit are also drawn. The vertical blue line indicates the position of the He iiλ4686 line. An auxiliary plot shows in black the residuals (in flux units) after modelling all the stellar and nebular features.