\begin{table}%t5
\caption{\label{ionic}Electron temperatures, ionic and total abundances for
the knots B and C of IIZw71.} 
%\begin{center}
{\small\begin{tabular}{l cc }
\hline
\hline
Knot & B & C \\                    
\hline                                    
$T$([O{\sc iii}])&  12~400~$\pm$~1700 K & 13~700~$\pm$~2000 K     \\ 
$T$([O{\sc ii}])$^a$ &  12~900~$\pm$~1300 K & 12~800~$\pm$~1300 K       \\ 
$T$([S{\sc iii}])$^b$ &  11~600~$\pm$~1100 K & 13~200~$\pm$~1200 K     \\ 
\hline
12~+~$\rm \log(O^+/H^+)$    &7.67~$\pm$~0.23 & 7.63~$\pm$~0.23   \\
12~+~$\rm \log(O^{2+}/H^+)$ & 7.63~$\pm$~0.19 & 7.57~$\pm$~0.19  \\
\bf{ 12~+~log(O/H)}     & 7.95~$\pm$~0.21 & 7.90~$\pm$~0.21 \\
\hline                                                                  
12~+~$\rm \log(S^+/H^+)$    & 5.94~$\pm$~0.12 & 5.83~$\pm$~0.13  \\
12~+~$\rm \log(S^{2+}/H^+)$ & 6.00~$\pm$~0.26 &  5.85~$\pm$~0.26  \\
ICF($\rm S^++S^{2+}$)     & 1.15~$\pm$~0.13 & 1.14~$\pm$~0.12 \\
\bf{ 12~+~log(S/H)}     & 6.33~$\pm$~0.24 & 6.20~$\pm$~0.24   \\
\hline                                                                  
12~+~$\rm \log(N^+/H^+)$    & 5.87~$\pm$~0.28 & 5.63~$\pm$~0.23   \\
\bf{log(N/O)}         & $-1.48$ ~$\pm$~0.37 & $-1.68$ ~$\pm$~0.32   \\
\hline                                                                  
12~+~$\rm \log(Ne^{2+}/H^+)$& 7.12~$\pm$~0.29 & 7.06~$\pm$~0.28   \\
ICF($\rm Ne^{2+}$)& 1.22~$\pm$~0.13 & 1.23~$\pm$~0.14   \\
\bf{ 12~+~log(Ne/H)}    & 7.19~$\pm$~0.35 &  7.13~$\pm$~0.35   \\
\hline                                                                  
12~+~$\rm \log(Ar^{2+}/H^+)$& 5.61~$\pm$~0.22 &  5.57~$\pm$~0.19  \\
ICF($\rm Ar^{2+}$)& 1.16~$\pm$~0.03 & 1.16~$\pm$~0.04   \\
\bf{ 12~+~log(Ar/H)}    & 5.65~$\pm$~0.26 &  5.60~$\pm$~0.26   \\
\hline                                                
\end{tabular}}
\parbox{8.3cm}{
$^a$ From a relation with $T$([O{\sc iii}]) based on photoionization models
$^b$ From an empirical relation with $T$([O{\sc iii}])}
%\end{center}
\end{table}