W80 (top panel) and v98 (bottom panel) measured in the integrated nuclear spectrum (R ∼ 0.5″) with respect to the emission lines IP. The dashed grey line in the top panel corresponds to a linear fit of the points and the 1σ uncertainty. The grey squares in the bottom panel indicate the v98 value reported by Davies et al. (2020) for the optical [S II] and [O III] lines with their uncertainties. The error bars in our data are obtained accounting for the standard deviation of the continuum near the line and the spectral resolution.