Figure 1:  Blue and red spectra for the 53 galaxies studied in this paper. For 52 of the observed AGNs we present 66 Åmm-1 spectra; in the case of VII Zw 73, we give 33 Åmm-1 spectra. For 4 of the observed objects, only one spectral region is available. All the spectra were de-redshifted to rest wavelengths. The spectral ranges displayed are $\lambda\lambda$4750-5120 Å and $\lambda\lambda$6480-6650 Å. In each frame the data points (small crosses), the best fit (solid line) and the residuals (lower solid line) are shown. For the red spectrum of SBS 1136+594, the individual components of the fit are also given as an example (dotted lines). \begin{figure*} \resizebox {18cm}{!}{\includegraphics{8046_11.eps}} \end{figure*}
 
Figure 1: Blue and red spectra for the 53 galaxies studied in this paper (continued).
\begin{figure*} \resizebox {18cm}{!}{\includegraphics{8046_12.eps}} \end{figure*}
  
Figure 1: Blue and red spectra for the 53 galaxies studied in this paper (continued).
\begin{figure*} \resizebox {18cm}{!}{\includegraphics{8046_13.eps}} \end{figure*}
 
Figure 1: Blue and red spectra for the 53 galaxies studied in this paper (continued).
\begin{figure*} \resizebox {18cm}{!}{\includegraphics{8046_14.eps}} \end{figure*}
  
Figure 1: Blue and red spectra for the 53 galaxies studied in this paper (end).
\begin{figure*} \resizebox {18cm}{!}{\includegraphics{8046_15.eps}} \end{figure*}