\begin{table}%t5
\par
\caption{Level indices, experimental and theoretical energy levels,
  and percentage compositions for the 27 levels of the 3s$^2$3p$^2$,
  3s3p$^3$ and 3s$^2$3p3d configurations of \ion{Fe}{xiii}. Experimental
  energies are from the NIST database \citep{martin95}
  except where otherwise stated. The first number in the percentage
  composition column is the contribution of the identified
  level. Other contributing levels from the same configuration do not
  have their configurations identified. Only percentages $\ge$5\% are listed.}\label{tbl.energies}
%\centerline
{
\begin{tabular}{llllll}
\hline
\hline
&&&\multicolumn{2}{l}{Energy (cm$^{-1}$)}\\
\cline{4-5}
Index & Configuration &Term &Expt. &Theory &Percentage
composition of levels \\
\hline
1  &3s$^2$3p$^2$ &$^3$P$_0$ & 0.0 &0.0
       &93.2\% \\
2  &           &$^3$P$_1$ & 9305.64$^a$ &9411.63
       &96.6\% \\
3  &           &$^3$P$_2$ &18566.76$^a$ &18722.40
       &87.7\% + 8.9\% $^1$D$_2$ \\
4  &           &$^1$D$_2$ &48~068 &48~359
       &87.6\% + 8.9\%  $^3$P$_2$\\
5  &           &$^1$S$_0$ &91~508 &91~753
       &91.8\% \\
6  &3s3p$^3$   &$^5$S$_2$ &214~624$^b$ &214~680 
       &97.9\% \\
7  &           &$^3$D$_1$ &287~205 &287~237
       &84.0\% + 10.3\% 3s$^2$3p3d $^3$D$_1$ \\
8  &           &$^3$D$_2$ &287~360 &287~401 
       &82.7\% + 9.9\%  3s$^2$3p3d $^3$D$_2$ \\
9  &           &$^3$D$_3$ &290~180$^b$ &290~307 
       &88.0\% + 10.2\% 3s$^2$3p3d $^3$D$_3$ \\
10 &           &$^3$P$_0$ &328~925$^b$ &329~076 
       &88.8\% + 9.2\% 3s$^2$3p3d $^3$P$_0$ \\
11 &           &$^3$P$_1$ &329~706$^b$ &329~797 
       &85.2\% + 9.1\%  3s$^2$3p3d $^3$P$_1$ \\
12 &           &$^3$P$_2$ &330~279  &330~411
       &77.4\% + 9.0\% 3s$^2$3p3d $^3$P$_2$\\
13 &           &$^1$D$_2$ &362~407$^b$ &362~651 
       &52.7\% + 38.7\%  3s$^2$3p3d $^1$D$_2$ \\
14 &           &$^3$S$_1$ &415~462 &415~432
       &75.4\% + 18.4\% $^1$P$_1$ \\
15 &3s$^2$3p3d &$^3$F$_2$ &432~741$^b$ &432~187 &96.0\% \\
16 &           &$^3$F$_3$ &439~420$^b$ &439~116 &96.4\%  \\
17 &3s3p$^3$   &$^1$P$_1$ &438~050 &438~401
        &68.2\% + 19.6\% $^3$S$_1$ + 8.7\% 3s$^2$3p3d $^1$P$_1$\\
18 &3s$^2$3p3d &$^3$F$_4$ &448~599 &449~369 &97.1\% \\
19 &           &$^3$P$_2$ &486~358 &486~456
        &47.3\%  + 20.5\% $^1$D$_2$ + 15.5\% 3s3p$^3$ $^1$D$_2$
          + 7.5\% $^3$D$_2$ \\
20 &           &$^3$P$_1$ &494~942 &494~260
        &58.1\% + 27.6\% $^3$D$_1$ + 6.2\% 3s3p$^3$ $^3$P$_1$ \\
21 &           &$^1$D$_2$ &498~870 &499~295 
        &34.9\% + 22.2\% $^3$P$_2$ + 23.2\% 3s3p$^3$ $^1$D$_2$ 
          + 11.0\% $^3$D$_2$ \\
22 &           &$^3$P$_0$ &501~520$^b$ &500~393
        &87.2\% + 9.2\% 3s3p$^3$ $^3$P$_0$ \\
23 &           &$^3$D$_1$ &506~502 &506~186
        &57.1\% + 28.4\% $^3$P$_1$ + 7.3\% 3s3p$^3$ $^3$D$_1$ \\
24 &           &$^3$D$_3$ &509~176 &509~594 
        &85.2\% + 9.8\% 3s3p$^3$ $^3$D$_3$  \\
25 &           &$^3$D$_2$ &509~250 &519~793  
        &67.5\% + 17.1\% $^3$P$_2$ + 8.3\% 3s3p$^3$ $^3$D$_2$ \\
26 &           &$^1$F$_3$ &556~870 &557~043 
        &95.4\% \\
27 &           &$^1$P$_1$ &570~690 &570~847
        &85.3\% + 8.9\%  3s3p$^3$$^1$P$_1$ \\
\hline
\end{tabular}}
\medskip
$^a$ \citet{pennkuhn94}.\\
$^b$ \citet{jupen93}.
\end{table}