Luminosity-Excitation Diagram (LED) from Fernández-Ontiveros & Muñoz-Darias (2021) indicating the location of the sources analysed in this study. Accretion-disc dominated sources in the soft state (e.g. 3C 273) are found in the upper-left side of the LED, while corona/jet-dominated sources in the hard state are found on the right side of the LED. The presence of strong shocks in the case of NGC 1386 (Rodríguez-Ardila et al. 2017) significantly enhance the flux of the [O IV]_25.9 line, causing a shift of this source to the left side of the LED. We note that the Eddington luminosities in this figure are based only on the luminosity of the [O IV]_25.9 and [Ne II]_12.8 lines, for consistency with the LED diagram in Fernández-Ontiveros & Muñoz-Darias (2021).