\begin{table}%t6
\caption{$\rm {O^{++}/H^{+}}$ abundances derived from recombination lines.}
\label{abund_o}
%\centering
\par
\begin{tabular}{lllll}
\hline
\hline
                         &              & \object{NGC~3242} &        &	\object{NGC~7009}  \\
$\lambda$ (\AA)          &        Mult. & $\rm  O^{++}/H^{+} \times  10^{4}$ && $\rm
O^{++}/H^{+} \times  10^{3}$ \\
\hline
4662                     &        1     & $5.91\pm0.84$  &	      &  $1.42\pm0.07$      \\
4676                     &	  1     &		 &	      &  $1.74\pm0.10$      \\
4317                     &	  2     &		 &	      &  $1.33\pm0.04$      \\
4415                     &	  5     & $5.01\pm1.25$  &	      &  $2.51\pm0.05$      \\
4132     	         &	 19     &		 &	      &  $0.90\pm0.06$      \\
4155                     &       19     &		 &	      &  $1.99\pm0.20$      \\
4089                     &       48     & $5.27\pm1.51$  &	      &  $2.21\pm0.08$      \\
4304                     &       54     &		 &	      &  $2.23\pm0.15$      \\
4276                     &       67     & $6.10\pm2.71$  &	      &  $1.92\pm0.08$      \\
4284                     &       67     &		 &	      &  $1.84\pm0.06$      \\
4609                     &       92     &		 &	      &  $2.62\pm0.15$      \\
Average                  &              & $5.57\pm0.20$  &	      &  $1.88\pm0.14$      \\
\hline
\end{tabular} 
\end{table}