\begin{table}%T4
\caption{\label{cel_ab}Ionic abundances derived from CELs.}
%\centerline
{
\begin{tabular}{llr}
\hline
\hline
X$^{i+}$/H$^+$ & Lines & $N_{{\rm X}^{i+}}/N_{{\rm H}^+}$\\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
C$^{2+}$/H$^+$&\ion{C}{iii}] $\lambda\lambda$1907,1909& 8.15~$\times$~10$^{-5}$\\
N$^+$/H$^+$ &[\ion{N}{ii}] $\lambda\lambda$6548, 6584 & 2.62~$\times$~10$^{-5}$\\
O$^+$/H$^+$ &[\ion{O}{ii}] $\lambda\lambda$3726, 3729 & 2.47~$\times$~10$^{-5}$\\
O$^{2+}$/H$^+$&[\ion{O}{iii}] $\lambda\lambda$4959, 5007&  3.39~$\times$~10$^{-4}$\\
Ne$^{2+}$/H$^+$&[\ion{Ne}{iii}] $\lambda\lambda3868, 3967$& 1.02~$\times$~10$^{-4}$\\
Ne$^{3+}$/H$^+$&[\ion{Ne}{iv}] $\lambda\lambda4724, 4725^{{a}}$ &7.44~$\times$~10$^{-5}$\\
S$^+$/H$^+$ & [\ion{S}{ii}] $\lambda\lambda$6716, 6731& 9.13~$\times$~10$^{-7}$\\
S$^{2+}$/H$^+$&  [\ion{S}{iii}] $\lambda6312$& 5.80~$\times$~10$^{-6}$\\
Cl$^{2+}$/H$^+$&[\ion{Cl}{iii}] $\lambda\lambda$5517, 5537&1.12~$\times$~10$^{-7}$\\
Ar$^{2+}$/H$^+$& [\ion{Ar}{iii}] $\lambda7135$ &1.62~$\times$~10$^{-6}$\\
Ar$^{3+}$/H$^+$&[\ion{Ar}{iv}] $\lambda\lambda4711, 4740$&5.24~$\times$~10$^{-7}$\\
\hline
\end{tabular}}
\smallskip
$^{{a}}$ Marginal.
\end{table}