Notes. Median estimates for sulphur and oxygen line ratios (first two rows) and electron density and temperature (third and fourth rows), for both narrow (NC) and outflow components (OC). Columns (1) and (2) show the results obtained from the analysis of median stacked spectra constructed collecting # [Col. (3)] spectra. Columns (4) and (5) display the median results obtained analysing sub-samples of # [Col. (6)] individual objects. The oxygen flux ratio and electron temperature obtained from the analysis of individual targets are obtained under the assumptions described in the text, and are referred to both NC and OC.
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