\begin{table}%t3
%\centering
\par
\caption{Line ratios observed (Cols. 2 and 3) and modeled with CLOUDY 
(Cols. 4 and 5) for the three
clusters, on the cluster's center (on) and at about 3\arcsec\ off center (off). The effective temperatures
 of the ionizing stars and the ionization parameter derived are given in the last two columns.} \label{cloudy}
\par
\begin{tabular}{ccccccc} 
\hline \hline&  [OIII]/$\rm H\beta$ (ob) & [NII]/$\rm H\alpha$
(ob) & [OIII]/$\rm H\beta$  & [NII]/$\rm H\alpha$ &  $T_*$ (K)  &   Log~$U$ \\ \hline 5253-1 on
&   3.62  & 0.080 &  3.50 & 0.079 &  42~000  &  --1.7 \\ 5253-1 off   &   4.35  &
0.066 &  4.35 & 0.066 &  47~000  &  --2.1 \\ \hline 5253-5 on   &   7.44  & 0.069
&  7.3 & 0.070 &  75~000  &  --2.0 \\ 5253-5 off   &   5.60  & 0.089 &  5.3 &
0.090 &  60~000  &  --2.1 \\ \hline He 2-10 on &   1.57  &  0.29  &  1.62  &
0.30  &  62~000  &  --2.9  \\ He 2-10 off &   1.29  &  0.20  &  1.24  &  0.20  &
55~000  &  --2.7  \\             \hline 
\end{tabular} 
\end{table}