[O III]λ5007 emission-line profiles (grey curves) and their fits (dashed curves) for an example with a single component (upper panel) and an example with two components (lower panel). The individual components A and B are shown as dot-dashed and three-dot-dashed curves, respectively, artificially offset by −0.1 in the y-axis. We considered both the velocity widths of any identified broad components (FWHM_B) and the flux-weighted average line widths of all identified components (FWHM_Avg) here.