\begin{table}%t1
%%\centering
\par
\caption{Comparison between NIST and our present GRASP energy levels (in~Ryd) for Al~XIII.\label{tab1}}
%\begin{center}
{
\begin{tabular}{rllrrr} 
\hline
\hline
Index  & Configuration & Level               &  NIST$^a$    &    GRASP$^b$ &   GRASP$^c$  \\
\hline
  1...&  1s  & $^2$S$_{1/2}$              &     0.000000 &     0.000000 &    0.000000  \\
  2...&  2s  & $^2$S$_{1/2}$              &   126.986288 &   127.012604 &  126.988960  \\
  3...&  2p  & $^2$P${\rm ^o}_{1/2}$	&   126.982560 &   127.012604 &  126.985252  \\
  4...&  2p  & $^2$P${\rm ^o}_{3/2}$	&   127.078367 &   127.108200 &  127.081062  \\
  5...&  3p  & $^2$P${\rm ^o}_{1/2}$	&   150.531340 &   150.561707 &  150.534500  \\
  6...&  3s  & $^2$S$_{1/2}$ 	&   150.532450 &   150.561707 &  150.535599  \\
  7...&  3d  & $^2$D$_{3/2}$ 	&   150.559680 &   150.590103 &  150.562851  \\
  8...&  3p  & $^2$P${\rm ^o}_{3/2}$	&   150.559700 &   150.590103 &  150.562897  \\
  9...&  3d  & $^2$D$_{5/2}$ 	&   150.569110 &   150.599503 &  150.572266  \\
 10...&  4p  & $^2$P${\rm ^o}_{1/2}$	&   158.769510 &   158.800095 &  158.772842  \\
 11...&  4s  & $^2$S $_{1/2}$	&   158.769980 &   158.800095 &  158.773300  \\
 12...&  4d  & $^2$D$_{3/2}$ 	&   158.781460 &   158.811996 &  158.784805  \\
 13...&  4p  & $^2$P${\rm ^o}_{3/2}$	&   158.781490 &   158.811996 &  158.784821  \\
 14...&  4d  & $^2$D$_{5/2}$ 	&   158.785450 &   158.815994 &  158.788773  \\
 15...&  4f  & $^2$F${\rm ^o}_{5/2}$	&   158.785440 &   158.815994 &  158.788773  \\
 16...&  4f  & $^2$F${\rm ^o}_{7/2}$	&   158.787420 &   158.817993 &  158.790756  \\
 17...&  5s  & $^2$S$_{1/2}$ 	&   162.581180 &   162.611603 &  162.584579  \\
 18...&  5p  & $^2$P${\rm ^o}_{1/2}$	&   162.580950 &   162.611603 &  162.584351  \\
 19...&  5d  & $^2$D$_{3/2}$              &   162.587060 &   162.617706 &  162.590469  \\
 20...&  5p  & $^2$P${\rm ^o}_{3/2}$	&   162.587070 &   162.617706 &  162.590485  \\
 21...&  5f  & $^2$F${\rm ^o}_{5/2}$	&   162.589000 &   162.619705 &  162.592499  \\
 22...&  5d  & $^2$D$_{5/2}$ 	&   162.589000 &   162.619705 &  162.592499  \\
 23...&  5g  & $^2$G$_{7/2}$ 	&   162.590100 &   162.620697 &  162.593521  \\
 24...&  5f  & $^2$F${\rm ^o}_{7/2}$	&   162.590100 &   162.620697 &  162.593521  \\
 25...&  5g  & $^2$G$_{9/2}$              &   162.590710 &   162.621307 &  162.594131  \\
\hline 
\end{tabular}}
$^a$: NIST ({\tt http://www.physics.nist/gov/PhysRefData}).\\
$^b$: Coulomb energies.\\
$^c$: QED corrected energies.
%\end{center}
\end{table}