\begin{table}%t2
%\centering
\par
\caption{Element abundances in regions {e}1 and {e}2.}
\label{t:Chem}
\begin{tabular}{lccc} 
\hline \hline
Value                               & region {e}1      && region {e}2  \\ \hline
$T_{\rm e}$(O {\sc iii})(K)               &$16490\pm140$   && $15910\pm540$ \\
$T_{\rm e}$(O {\sc ii})(K)                &$14430\pm110$   && $14170\pm460$ \\
$T_{\rm e}$(S {\sc iii})(K)               &$15380\pm110$   && $14900\pm450$ \\
$N_{\rm e}$(S {\sc ii})(cm$^{-3}$)        &$ 60\pm30$  &&  $90\pm80$   \\ \\
%$N_{\rm e}$(He {\sc ii})(cm$^{-3}$)             &    ..$\pm$..  &&    ..$\pm$.. \\
%$\tau$($\lambda$3889)               &       0.0     &&       0.0 \\ \\
O$^+$/H$^+$($\times$10$^5$)         &$0.930\pm0.020$ && $1.127\pm0.101$\\
O$^{+2}$/H$^+$($\times$10$^5$)      &$3.071\pm0.063$ && $2.997\pm0.256$\\
O$^{+3}$/H$^+$($\times$10$^6$)      &$0.994\pm0.057$ &&      ...      \\
O/H($\times$10$^5$)                 &$4.100\pm0.067$ && $4.123\pm0.275$\\
12 + log(O/H)                       &$7.61\pm0.01$   && $7.62\pm0.03$\\ \\
%---------------------------------------------------------------------------
N$^{+}$/H$^+$($\times$10$^7$)       &$2.564\pm0.056$  && $3.460\pm0.311$\\
ICF(N)$^{a}$                          &4.41~~~~~~~~~~~~&& 3.66~~~~~~~~~~~~\\
log(N/O)                             &$-1.560\pm0.017$~~&&$-1.513\pm0.069$~~\\ \\
%---------------------------------------------------------------------------
Ne$^{+2}$/H$^+$($\times$10$^5$)     &$0.480\pm0.011$&& $0.491\pm0.045$\\
ICF(Ne)$^{a}$                         &1.34~~~~~~~~~~~~&&1.38~~~~~~~~~~~~\\
log(Ne/O)                            &$-0.806\pm0.014$~~&&$-0.786\pm0.057$~~\\ \\
%---------------------------------------------------------------------------
S$^+$/H$^+$($\times$10$^7$)         &$1.618\pm0.025$  && $2.028\pm0.118$\\
S$^{+2}$/H$^+$($\times$10$^7$)      &$6.980\pm0.350$  && $5.942\pm1.335$\\
ICF(S)$^{a}$                          &1.50~~~~~~~~~~~~&&1.39~~~~~~~~~~~~\\
log(S/O)                             &$-1.503\pm0.016$~~&&$-1.571\pm0.068$~~\\ \\
%---------------------------------------------------------------------------
Cl$^{++}$/H$^+$($\times$10$^8$)      &$1.017\pm0.223$  &&      ...      \\
ICF(Cl)$^{a}$                          &1.57~~~~~~~~~~~~&&       ...      \\
log(Cl/O)                             &$-3.409\pm0.076$~~&&    ...      \\ \\
%-----------------------------------------------------------------------
Ar$^+2$/H$^+$($\times$10$^7$)        &$1.449\pm0.032$  && $1.743\pm0.130$\\
Ar$^{+3}$/H$^+$($\times$10$^7$)      &$0.608\pm0.119$  &&      ...      \\
ICF(Ar)$^{a}$                          &1.05~~~~~~~~~~~~&&  1.64~~~~~~~~~~~~\\
log(Ar/O)                             &$-2.280\pm0.026$~~&&$-2.158\pm0.038$\\ \\
%----------------------------------------------------------------------------
Fe$^{++}$/H$^+$($\times$10$^7$)      &$1.320\pm0.200 $ &&      ...      \\
ICF(Fe)$^{a}$                          &5.51~~~~~~~~~~~~&&       ...      \\
log(Fe/O)                             &$-1.751\pm0.016$~~&&    ...      \\ 
%[O/Fe] ??????? [ ]
$[$O/Fe$]$$^{b}$                 &0$.331\pm0.029$  && ...  \\ \\
%---------------------------------------------------------------------------
He$^+$/H$^+$($\lambda$4471)         &$0.071\pm0.002$&& $0.070\pm0.009$ \\
He$^+$/H$^+$($\lambda$5876)         &$0.081\pm0.001$&& $0.083\pm0.004$ \\
He$^+$/H$^+$($\lambda$6678)         &$0.082\pm0.002$&& $0.081\pm0.008$ \\
He$^+$/H$^+$                        &                 &&                  \\
(weighted mean)                     &$0.080\pm0.001$&&$ 0.080\pm0.003$ \\
He$^{+2}$/H$^+$($\lambda$4686)      &$0.002\pm0.000$&&       ...       \\
He/H                                &$0.082\pm0.001$&& $0.080\pm0.003$ \\
$Y$                                 &$0.246\pm0.003$&& $0.243\pm0.010$ \\ \hline
\multicolumn{3}{l}{$^{a}$~ICF is the ionization correction factor.}\\
\multicolumn{3}{l}{$^{b}$~$[$O/Fe$]$ $\equiv$ log (O/Fe) -- log (O/Fe)$_\odot$.}\\
\end{tabular}
\end{table}