\begin{table}%t2
%\centering
\par
\caption{The configurations used to calculate the radiative data.
 The configurations are ordered according to their 
relative energies, and grouped by odd or even parity.\label{tab:conf}}
\begin{tabular}{lclcl}
\hline\hline\noalign{\smallskip}
   &          Odd  &    &  Even      &  \\
\hline\noalign{\smallskip}
c1 & 3s$^2$ 3p$^5$ & c2 &  3s 3p$^6$ &  \\
c4 &  3s 3p$^5$ 3d & c3 &  3s$^2$ 3p$^4$ 3d & \\
c5 &  3s$^2$ 3p$^3$ 3d$^2$ & c6 &  3s$^2$ 3p$^2$ 3d$^3$ &  \\
c10 &  3s 3p$^3$ 3d$^3$ &  c7 &  3s$^2$ 3p$^4$ 4s &  \\
c11 &  3s$^2$ 3p$^4$ 4p &   c8  & 3s 3p$^4$ 3d$^2$ &  \\
\par
c13 & 3p$^5$ 3d$^2$   &  c9  & 3p$^6$ 3d &  \\
 c14 &  3s 3p$^5$ 4s & c12 &  3s$^2$ 3p$^4$ 4d &  \\
c16 &  3s$^2$ 3p$^4$ 4f  &    c15 &  3s 3p$^5$ 4p &  \\ 
\noalign{\smallskip}
\hline
\end{tabular}
\end{table}