Example fits (both stellar continuum and emission lines) of spectral regions around auroral lines for two H II regions in NGC 5068 (IDs: 268 in the upper panels, the same as Fig. 1, and 817 in the lower panels). The [NII]λ5756, [SIII]λ6312 and [OII]λλ7320, 7330 auroral lines are detected with corresponding S/N of 29, 39, 22, and 20 for region 268 and 6, 7, 7, and 7 for region 817. The flux in the y axis is expressed in the same units as Fig. 1. In the lower panels, we additionally report as a shaded region the spectral error band, already re-scaled by the residuals’ standard deviation.