\begin{table}%t6
%\arraystretch{0.5}   
\caption{\label{flux_qso} Observed fluxes for the two high redshift QSOs in units of $\rm 10^{-15}~ erg ~ cm^{-2} ~ s^{-1}$.
The fluxes of the permitted lines are the total flux of the line.}   
%\centering
\small
\begin{tabular}{lccc|cccc}
\hline\hline
\noalign{\smallskip}
Ion  & $\rm \lambda_{lab}~(\AA)$& Ton~0156 &  3C~351 & Ion  & $\rm \lambda_{lab}~(\AA)$& Ton~0156 &  3C~351\\
\hline \noalign{\smallskip}
\ion{H}{i}	     & 6563	& $200.12\pp 2.11$ & $935.04\pp 24.70^{\delta}$ &\ion{H}{i}	     & 10 049	& $11.04\pp 1.13$  &     -        \\
\ion{O}{i}+\ion{Ca}{ii}&8486    &  $8.57\pp 2.14$  & $72.11\pp 4.16$            & \ion{Fe}{ii}      & 10 500	 &  $1.87\pp 0.45$  &   -         \\
\lb\ion{S}{iii}\rb   & 9069	&     -         & $4.22\pp 0.16$             & \ion{He}{ii}      & 10 830	 & $16.42\pp 1.03$  & $52.01\pp 3.40$ \\
\lb\ion{S}{iii}\rb   & 9531	&     -         & $11.33\pp 0.43$            & \ion{H}{i}        & 10 938	 & $9.59\pp 0.70$   & $18.74\pp 3.37$ \\     
\ion{Fe}{ii}         & 9127     &  $0.57\pp 0.14$  &      -                  & \ion{O}{i}        & 11 287	 &  $2.53\pp 0.63$  &		\\ 
\ion{Fe}{ii}         & 9177     &  $1.05\pp 0.26$  &      -                  & \ion{H}{i}        & 12 820	 & $14.16\pp 0.79$  &  $22.09\pp 4.85$ \\
\hline\noalign{\smallskip}
\multicolumn{6}{l}{$\delta$ Blend with [\ion{N}{ii}] 6548~$\AA$ and [\ion{N}{ii}] 6583~$\AA$.} 
\end{tabular}
\end{table}