\begin{table}%t7
\par
\caption{\label{table7}He$^+$ and He$^{++}$ abundances.}
\small%\centerline
{
\begin{tabular}{lccccc}
\hline\hline 
		& PB8 		  	& NGC~2867--1		& NGC~2867--2	& PB6--1	& PB6--2	\\
\hline 
Lines			& 12		    	& 12	  		&  12 		& 4  		& 4 	 	\\ 
He$^+$/H$^+$$^{b}$	& 1222~$\pm$~22    	& 771~$\pm$~18	  	&  868~$\pm$~24 	& 276~$\pm$~31  	& 354~$\pm$~36  	\\ 
$\tau_{3889}$		& 6.55~$\pm$~0.87		& 3.65~$\pm$~1.14     	&  5.19~$\pm$~1.25& 1.48:		& 4.10:		\\ 
$\chi^2$ 		& 12.4		  	& 16.5		 	&  11.1		& 0.34	 	& 1.45		\\ 
			& 			&			&		&		&		\\ 
He$^{++}$/H$^+$		& \nodata    		& 325~$\pm$~6	  	&  342~$\pm$~7 	& 1614~$\pm$~41  	& 1439~$\pm$~33  	\\ 
\hline 
\end{tabular}}
\smallskip
$^{a}$ In units of 10$^{-4}$. Errors correspond to the uncertainties in line flux measurements.\\
$^{b}$ It includes all uncertainties related with line intensities, {\elecd}, $\tau_{3889}$ and~{\tsq}. 
\end{table}