Summary of the multi-Gaussian fitting of Hβ, [O III] λ4959Å, and S II for the entire sample. Top: 2D spectra, with the y-axis in pixel units. Center: Gaussian fits for Hβ (left), [O III]λ4959Å (center), and S II (right). Bottom: Residuals of the fit. The peak emission of each line normalizes the flux. Spectra are shown in light blue ("Data"). The blue shadow represents the variance spectrum. The black line indicates the fit. The dashed lines show the different fitted components. The yellow line represents the continuum. Gray shadows are flagged regions excluded from fits. Insets that zoom in onto the faint line wings are included in the upper-right corner of each plot.