\begin{table}%T1
\caption{Excitation energies of Cl~II states relative to the ground state. Present
theory is compared with the NIST compilation ({\tt http://physics.nist.gov}) and the calculations
of Wilson \& Bell (2002) (WB) and Berrington \& Nakazaki (2002) (BN).}\label{t1}
%\centerline
{
\begin{tabular}{lcccc}
\hline\hline
\multicolumn{1}{l}{State} &
\multicolumn{1}{c}{Present theory} &
\multicolumn{1}{c}{Experiment}  &
\multicolumn{1}{c}{WB} &
\multicolumn{1}{c}{BN} \\
\hline
    $\rm 3s^23p^4$~$\rm ^3P$& 0.0000 &   0.0000 & 0.0000 & 0.0000  \\
    $\rm 3s^23p^4$ $\rm ^1D$& 0.1058 &   0.1031 & 0.1103 & 0.1082 \\
    $\rm 3s^23p^4$ $\rm ^1S$& 0.2526 &   0.2509 & 0.2589 & 0.2675 \\
    $\rm 3s3p^5$ $\rm ^3P^{\circ}$& 0.8210 &   0.8506 & 0.8301 & 0.8500 \\
    $\rm 3s^23p^3(^4S^{\circ})4s$ $\rm ^5S^{\circ}$& 0.9813 & 0.9800 & 0.9788 & 0.9791 \\
    $\rm 3s^23p^3(^4S^{\circ})3d$ $\rm ^5D^{\circ}$& 0.9962 & 1.0020 & 0.9949 & 1.0044 \\
    $\rm 3s^23p^3(^4S^{\circ})4s$ $\rm ^3S^{\circ}$& 1.0242 & 1.0231 & 1.0352 & 1.0221 \\
    $\rm 3s^23p^3(^2D^{\circ})3d$ $\rm ^1P^{\circ}$& 1.0353 & 1.0508 & 1.0457 & 1.0596$^{{a}}$ \\
    $\rm 3s^23p^3(^4S^{\circ})3d$ $\rm ^3D^{\circ}$& 1.0875 & 1.0887 & 1.1033 & 1.0973 \\
    $\rm 3s^23p^3(^2D^{\circ})3d$ $\rm ^1S^{\circ}$& 1.1319 & 1.1382 & 1.1281 & 1.1481 \\
    $\rm 3s^23p^3(^2D^{\circ})3d$ $\rm ^3F^{\circ}$& 1.1554 & 1.1476 & 1.1627 & 1.1617 \\
    $\rm 3s^23p^3(^2D^{\circ})4s$ $\rm ^3D^{\circ}$& 1.1742 & 1.1520 & 1.1743 & 1.1677 \\
    $\rm 3s^23p^3(^4S^{\circ})4p$ $\rm ^5P$&   1.1721 & 1.1696 &        &1.1634 \\
    $\rm 3s^23p^3(^2D^{\circ})4s$ $\rm ^1D^{\circ}$& 1.1903 & 1.1730 &        & 1.1886 \\
    $\rm 3s^23p^3(^4S^{\circ})4p$ $\rm ^3P$&   1.2063 & 1.1976 &        & 1.1921 \\
    $\rm 3s^23p^3(^2P^{\circ})4s$ $\rm ^3P^{\circ}$& 1.2726 & 1.2526 &        & 1.2752 \\
    $\rm 3s^23p^3(^2P^{\circ})4s$ $\rm ^1P^{\circ}$& 1.2939 & 1.2750 &        & 1.2980 \\
    $\rm 3s^23p^3(^2D^{\circ})3d$ $\rm ^3D^{\circ}$& 1.3203 & 1.2828 &        & 1.2959 \\
    $\rm 3s^23p^3(^2P^{\circ})3d$ $\rm ^3P^{\circ}$& 1.3420 & 1.3248 &        & 1.3472 \\
    $\rm 3s^23p^3(^2P^{\circ})3d$ $\rm ^3D^{\circ}$& 1.4482 & 1.3719 &        & 1.3881 \\
    $\rm 3s^23p^3(^2D^{\circ})3d$ $\rm ^3P^{\circ}$& 1.4905 & 1.4310 &        & 1.4534 \\
    $\rm 3s^23p^3(^2D^{\circ})4d$ $\rm ^1P^{\circ}$& 1.5343 & 1.4842 &        & 1.5013$^{{a}}$ \\
    $\rm 3s^23p^3(^2P^{\circ})3d$ $\rm ^1P^{\circ}$& 1.5984 & 1.5480 &        & 1.5718 \\
\hline
\end{tabular}}
\par
\medskip
$^{{a}}$ The labeling of these states from Berrington \& Nakazaki (2002) are changed to match our assignments.
\end{table}