\begin{table}%t1
%\centering
\par
\caption{\label{tab:estat}[\ion{O}{iii}] ratio and electron temperature statistics.}
\small \begin{tabular}{lllllcllll}
\hline \hline
\noalign{\smallskip}
 & \multicolumn{4}{c}{[\ion{O}{iii}] ratio} & & \multicolumn{4}{c}{$T_{\rm e}$ (K)}\\ 
\noalign{\smallskip}
\cline{2-5} \cline{7-10}
\noalign{\smallskip}
& \multicolumn{4}{c}{Slit position $\Delta\delta$} & & \multicolumn{4}{c}{Slit position $\Delta\delta$} \\
& 30\arcsec N & 0\arcsec & 30\arcsec S & all & & 30\arcsec N & 0\arcsec & 30\arcsec S & all \\
\hline
\noalign{\smallskip}
number of data $N$ 	    & 63  & 58  & 58  & 179 & & 63    & 58    & 58    & 179   \\
minimum 	     	    & 58  & 67  & 96  & 58  & & 10~082 & 9598  & 9078  & 9078  \\
first quartile $Q1$  	    & 102 & 94  & 120 & 99  & & 12~140 & 12~239 & 11~384 & 11~786 \\
median 	             	    & 112 & 103 & 130 & 111 & & 12~581 & 12~695 & 11~657 & 12~331 \\
third quartile $Q3$  	    & 118 & 114 & 138 & 126 & & 12~766 & 13~174 & 12~235 & 12~879 \\
maximum 		    & 203 & 239 & 168 & 291 & & 16~291 & 15~142 & 14~481 & 16~291 \\
weighted mean  	 	    & 112 & 105 & 131 & 115 & & 12~418 & 12~678 & 11~713 & 12~269 \\
weighted standard deviation & 9   & 10  & 11  & 13  & & 635   & 675   & 591   & 751   \\
\hline
\end{tabular}           
\end{table}