\begin{table}%t13
\par
\caption{\label{table13}{\tsq} parameter.}
\small%\centering
\par
\begin{tabular}{lccccc}
\hline\hline
Method 			& PB8 				& NGC~2867--1 			& NGC~2867--2 			& PB6--1 	& PB6--2	\\
\hline
O$^{\rm ++}$ (R/C)	& 0.037~$\pm$~0.005		& 0.045~$\pm$~0.009       	& 0.061~$\pm$~0.010       	& \nodata	& 
\nodata	\\
Ne$^{\rm ++}$ (R/C)	& 0.016~$\pm$~0.012		& \nodata		       	& \nodata       		& \nodata	& \nodata	
\\
He$^{\rm +}$ 		& 0.008$^{+0.020}_{-0.028}$	& 0.039~$\pm$~0.019 		& 0.053~$\pm$~0.022       	& 0.102::       
& 0.139::	\\
Bac--CELs 		& 0.038$^{+0.013}_{-0.016}$	& 0.061$^{+0.041}_{-0.061}$	& 0.056$^{+0.050}_{-0.056}$	& \nodata	& 
\nodata	\\ 
Adopted 		& {\bf 0.033~$\pm$~0.005}		& {\bf 0.044~$\pm$~0.008} 	& {\bf 0.060~$\pm$~0.010} 	& \nodata	& 
\nodata	\\ 
\hline
\end{tabular}
\end{table}