Median stacked spectrum around the [S II] emission line doublet obtained combining the spectra of sources with evidence of ionised outflows and without blending problems with Hα BLR emission. Dashed curves highlight 1σ uncertainties. The red curve represents the best-fit result we obtained fitting simultaneously Hα, [N II] and [S II] doublets. The green Gaussians represent NC and BC components, blue profiles mark OC.
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