Evidence of a broad velocity component in the strongest emission lines from O3-N, namely [O III] λλ 4960,5008 (left) and Hα +[N II] λλ 6550,6585 (right). In both lines, a double Gaussian profile is preferred over a single Gaussian fit (not shown), based on the former having a larger log(Z), and lower AIC and BIC scores (see upper right legends). The bottom panels show the residuals of the subtraction of the best-fit model from the data, in units of σ.