Multi-component fit of the H_β, [O III] 4959Å and [O III] 5007Å lines (top) and the H_α, [N _II] 6548Å and [N _II] 6584Å lines (bottom). The solid blue lines show the observed continuum-subtracted spectrum, with the blue shaded areas indicating the 1σ, 2σ, and 3σ uncertainties. Dotted green lines show the different components of the fit, while the orange dashed lines show the total model. Grey vertical lines show the expected center of the nebular emission lines. The bottom panels show the residuals of the fit. The spectral resolution is around R = 100 near H_β and R = 200 near H_α.