\begin{table}%T3
\par
  %\centering
\par
    \caption{Electron temperature indicators in \me.}\label{tab-3}
\par
  \begin{tabular}{lcccc}
  \hline
  \hline
  Ion & Ioniz. & Lines& Observed & $T_{{\rm e}}$\\
   & Pot. (eV)& Used &Ratio  & (K) \\
  \hline
\par
  \ion{[N}{ii]} & 14.5 & 5755/6584 & 0.0223 & 11~500\\
  \ion{[S}{iii]} & 23.3 & 6312/9531 & 0.0494 & 12~800 \\
  \ion{[Ar}{iii]} & 27.6 & 5192/7136 & 0.0120 & 12~000\\
  \ion{[O}{iii]} & 35.1 & 4363/5007 & 0.0155 & 13~500\\
  \ion{[O}{iii]} & 35.1 & 1663/5007  & 0.032 & 13~000\\
  \ion{[Ne}{iii]} & 41.0 & 3868/15.5 & 1.375 & 12~700\\
  \ion{[O}{iv]}  & 54.9 & 1400/25.9  & 0.0943 & 16~000\\
  \ion{[Ne}{iv]} & 63.4 & 2424/4725 & 0.0109 & 18~000\\
  \ion{[Ne}{v]} & 97.1 & 3425/24.3 & 1.13  & 21~000\\
  \ion{[Mg}{v]} & 109.3 & 2784/5.61 & 0.585 & 17~000\\
 \hline
  \end{tabular}
    \end{table}