\begin{table}%t2
%\centering
\par
\caption{\label{table2}Electron density ($\log(N_{\rm{e}}/\rm{cm}^{-3}$))
measurements, for the sunspot observed in 2006.} 
\small 
 \begin{tabular}{lrcllll}
\hline\hline\noalign{\smallskip}
Ion & Wavelength pair (${\AA}$) & $T_{\rm{f}}~(\log$~K) & Umbra & Penumbra & Plage & Plume \\
\hline \noalign{\smallskip}
\ion[Si iii]  & 1301.16/1298.96 & 4.68 & $\rm 11.1^{+0.5}_{-0.4}$ & $>$11.0 & & $\rm 11.1^{+0.5}_{-0.4}$ \\
\ion[C iii]   & 1175.98/1175.24 & 4.84 & $>$9.3 & $>$9.3 & $>$9.2 & $>$9.4 \\
\ion[O iv]    & 1399.77/1401.16 & 5.18 & $\rm 10.2^{+0.4}_{-1.2}$ & $\rm 11.0^{+0.7}_{-0.5}$ & $\rm 10.8^{+0.5}_{-0.5}$ & $\rm 10.3^{+0.4}_{-0.3}$ \\
\ion[O iv]    & 1407.39/1401.16 & 5.18 & $\rm 10.3^{+0.4}_{-0.8}$ & $\rm 10.9^{+0.5}_{-0.4}$ & $\rm 11.0^{+0.6}_{-0.4}$ & $\rm 10.4^{+0.4}_{-0.7}$ \\
\ion[O v]     & 758.68/761.13   & 5.37 & $\rm 10.1^{+0.1}_{-0.2}$ & $\rm 10.9^{+0.3}_{-0.2}$ & $\rm 11.0^{+0.3}_{-0.3}$ & $\rm 10.1^{+0.2}_{-0.1}$ \\
\ion[O v]     & 759.43/761.13   & 5.37 & $\rm 10.0^{+0.2}_{-0.1}$ & $\rm 11.0^{+0.5}_{-0.2}$ & $\rm 11.0^{+0.5}_{-0.2}$ & $\rm 10.1^{+0.1}_{-0.2}$ \\
\ion[O v]     & 760.43/761.13   & 5.37 & $\rm 10.0^{+0.2}_{-0.2}$ & $\rm 11.2^{+0.6}_{-0.3}$ & $\rm 11.0^{+0.3}_{-0.3}$ & $\rm 10.1^{+0.2}_{-0.2}$ \\
\ion[O v]     & 761.99/761.13   & 5.37 & $\rm 10.0^{+0.2}_{-0.1}$ & $\rm 10.9^{+0.4}_{-0.2}$ & $\rm 11.0^{+0.4}_{-0.2}$ & $\rm 10.0^{+0.2}_{-0.1}$ \\
\ion[Mg viii] & 769.38/782.34   & 5.90 & $<$12.0 & & & $<$11.9 \\
\ion[Fe xii]  & 1349.43/1241.95 & 6.13 & $\rm 9.3^{+1.3}_{-1.3}$ & $<$10.1 & $<$10.2 & $<$7.6 \\[1mm]
 \hline
\end{tabular}
\end{table}