\begin{table} 
\caption{Comparison between experimental (Tr\"{a}bert et~al. 2003) and theoretical lifetimes for some levels of Fe IX.}
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%\begin{center}
\par
(a) $\tau$ (in ms)
\par
 \begin{tabular}{llcl} 
\hline
\hline   
Level & Experimental & Present Calculations & Flower (1977) \\
\hline 
3s$^2$3p$^5$3d $^3$D$^o_3$ & 29$\pm$3     & 32.02 & 33 \\ 
3s$^2$3p$^5$3d $^3$D$^o_2$ & 10.5$\pm$1   &  9.55 & 10 \\ 
3s$^2$3p$^5$3d $^1$F$^o_3$ & 6.9$\pm$0.3  &  7.36 & 7.9 \\ 
\hline
\end{tabular}
\par
\vspace*{0.5 cm}
\par
(b) $\tau$ (in s), $a{\pm}b \equiv a{\times}$10$^{{\pm}b}$
\par
\begin{tabular}{lcl}
\hline
\hline
Level &  Present Calculations & Verma et~al. (2006) \\
\hline
3s$^2$3p$^5$3d $^3$P$^o_1$ &  7.119--08  & 7.9923--08 \\ 
3s$^2$3p$^5$3d $^3$D$^o_1$ &  3.692--09  & 3.8158--09 \\ 
3s$^2$3p$^5$3d $^1$P$^o_1$ &  3.957--12  & 4.4127--12 \\ 
3s3p$^6$3d $^3$D$_1$       &  1.222--10  & 1.8909--10 \\
3s3p$^6$3d $^3$D$_2$	   &  1.220--10  & 1.8856--10 \\
3s3p$^6$3d $^3$D$_3$	   &  1.215--10  & 1.8800--10 \\
3s3p$^6$3d $^1$D$_2$       &  2.613--10  & 4.4887--10 \\
\hline
\end{tabular}
%\end{center}
\par
\end{table}