\begin{table}%t2
%\centering
\par
%
\par
\caption {\label {hfs}Parameters of the barium lines.  $C_{6}= \Delta \omega ~r^6 / 2 \pi$,  following (Uns\"old \cite {Uns68}), in $\rm cm^6 ~s^{-1}$.
}
%\begin{tabular}{l c c c c c c c }
\begin{tabular}{lc@{~~}c@{~~~}r@{~~~~} c@{~~}c@{~~~}c@{~~~}c@{ }}
\hline\hline
\noalign{\smallskip}
$\rm \lambda (\AA)$& $E_{i}$& $E_{k}$& HFS           & \it f & \it f& $\rm \gamma_{\rm rad}$&$\rm log C_{6}$\\
                   &       &         &$\Delta\lambda$&  solar& 50:50& s$^{-1}$&  \\
                   &  eV   &   eV    &   m\AA        \\
\hline
\noalign{\smallskip}
4554.03& 0.00& 2.72&  0&  0.597&  0.364&  $1.58\times 10^8$&  --31.3\\
       &     &     & 18&  0.081&  0.227& \\
       &     &     &--34&  0.049&  0.137& \\
\\
5853.70& 0.60& 2.72& -- &  0.025&  --    &  $1.58\times 10^8$&  --30.4\\
\\
6496.90& 0.60& 2.51&  0&  0.086&  --    &  $1.25\times 10^8$&  --31.1\\
       &     &     & --4&  0.012&  --    &\\
       &     &     &  9&  0.007&  --    &\\ 
\hline  
\end{tabular}  
\end{table}