\begin{table}%T8
     \caption{\label{tab8}Parameters of the CLOUDY model best-fitting the de-reddened 
              emission line ratio of Table~\ref{tab7}. {\it From top to bottom}: temperature
              and radius of the central black-body source, inner and outer radii
              of the emitting shell, hydrogen density at inner and outer radii,
              electronic density at the inner and outer radii, ratio of the filled 
              to vacuum volumes, element abundances relative to solar.}
     %\centering
\par
     \includegraphics[width=3.8cm,clip]{9502tab8.ps}
       \end{table}