\begin{table}%t3
\caption{\label{table3}The details of the filling factor calculations, for the O~{\sc{v}} emission of the sunspot plume observed in 2006. } 
%\centerline
 {\small 
\begin{tabular}{cccrcc}
\hline\hline\noalign{\smallskip}
Line (${\AA}$) & $I$ & $\rm{log}$~$N_{\rm{e}}$ & $G(T_{\rm{max}},N_{\rm{e}})$   & $L~\rm{(Mm)}$ & $f$\\
\hline\noalign{\smallskip}
758.68 & 190.77 & 10.12 & $2.81\times10^{-25}$   & 0.5 & 0.096\\
 &  &  &   & 7.0 & 0.007\\
%\hline
759.43 & 154.72 & 10.09 & $2.15\times10^{-25}$   & 0.5 & 0.120\\
 &  &  &   & 7.0 & 0.009\\
%\hline
761.99 & 202.43 & 10.03 & $2.61\times10^{-25}$   & 0.5 & 0.160\\
 &  &  &    & 7.0 & 0.012\\
%\hline
774.51 & 44.19  & 10.03 & $5.54\times10^{-26}$   & 0.5 & 0.170\\
 &  &  &    & 7.0 & 0.012\\
\hline
\end {tabular}}
\medskip
The units of $I$, $N_{\rm{e}}$ and $G(T_{\rm{max}},N_{\rm{e}})$ are
$\rm{erg~cm^{-2}~s^{-1}~sr^{-1}}$, $\rm{cm}^{-3}$ and
$\rm{erg~cm^{-3}~s^{-1}~sr^{-1}}$, respectively.
\end {table}
\par
The derived filling factors turn out to be relatively large, which
might explain the very strong TR emission of sunspot plumes. To
compare the filling factor of the plume with those of other
features, we can assume that the integration paths in various
regions are the same, although this assumption might not be
realistic due to a possible difference in their thermal and magnetic
structures. Again we obtained the average intensities of the four
regions, and calculated $G(T_{\rm{max}})$ at corresponding densities
by using the CHIANTI database. The ratios of the filling factors in
the four regions are listed in Table~\ref{table4}.
\par
\begin{table}%t4
%\centering
\par
\caption{\label{table4}The ratios of the filling factors in the four regions, for the O~{\sc{v}} emission in the 2006 data set.} 
\small \begin{tabular}{rc}
\hline\hline\noalign{\smallskip}
Line (${\AA}$)  & Ratio (umbra : penumbra : plage : plume)\\
\hline
758.68   & 70.8 : 1.0 : 6.3 : 846.2\\
%\hline
759.43   & 211.8 : 1.0 : 9.6 : 2058.8\\
%\hline
761.99   & 114.3 : 1.0 : 5.9 : 1507.9\\
%\hline
774.51   & 69.3 : 1.0 : 2.4 : 666.7\\
\hline
\end{tabular}
\end{table}