$\begin{figure} \par\includegraphics[width=8cm,clip]{4112fig2.eps}\end{figure}$ Figure 2: Spatial profiles of the $\rm H\beta$ , [O III] $\lambda~ 4959$ and O II $\lambda~ 4661$ fluxes (in units of 10^-13 ergs cm^-2 s^-1) for NGC 7009.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{4112fig3.eps}\end{figure}$ Figure 3: Spatial profiles of the ${\rm O^{++}}/\rm H^{+}$ abundances from the recombination line O II $\lambda~ 4661$ (rec) and from the forbidden lines [O III] $\lambda~\lambda~ 4959, 5007$ (coll) and of the ratio between these two abundance estimates for NGC 7009.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{4112fig4.eps}\end{figure}$ Figure 4: Ratio between the values of ${\rm O^{++}}/\rm H^{+}$ derived from recombination and forbidden lines versus electron density $N_{\rm e}$ (Ar IV) for NGC 7009.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{4112fig1.eps}\end{figure}$	Figure 1: A sample of the spectral region around 4661 Å for NGC 7009.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{4112fig2.eps}\end{figure}$	Figure 2: Spatial profiles of the $\rm H\beta$ , [O III] $\lambda~ 4959$ and O II $\lambda~ 4661$ fluxes (in units of 10^-13 ergs cm^-2 s^-1) for NGC 7009.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{4112fig3.eps}\end{figure}$	Figure 3: Spatial profiles of the ${\rm O^{++}}/\rm H^{+}$ abundances from the recombination line O II $\lambda~ 4661$ (rec) and from the forbidden lines [O III] $\lambda~\lambda~ 4959, 5007$ (coll) and of the ratio between these two abundance estimates for NGC 7009.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{4112fig4.eps}\end{figure}$	Figure 4: Ratio between the values of ${\rm O^{++}}/\rm H^{+}$ derived from recombination and forbidden lines versus electron density $N_{\rm e}$ (Ar IV) for NGC 7009.
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