See text for a general description of the figure. NGC 4552: for HST/STIS spectrum, a second and a broad component were necessary to model emission lines. [O I] lines are very noisy and weak, thus they could not be used as a template for forbidden lines and narrow Hα. A broad component is not required to fit the Hα profile. On the contrary, for the Palomar spectrum, all the emission lines can be reproduced with only a single component.