\begin{table} %t6
%\centering
\par
\caption{\label{tab6}Comparison between the present effective collision 
strengths in LS-coupling and
those of Sunderland et~al. (\cite{Sunderland2002}). The data is for transitions
from the 3d$^7$ $\rm ^4F$ ground state to other terms of the 3d$^7$ configuration.}
%\centering
\par
\begin{tabular}{@{}ccccccc}
            \hline\hline
 & \multicolumn{2}{c}{\ {5000~K}} &  \multicolumn{2}{c}{\ 10~000~K} & \multicolumn{2}{c}{\ 40~000~K} \\
      & Present & Sunderland & Present & Sunderland  & Present & Sunderland \\
            \hline
$\rm ^4P$& 7.337 & 6.851& 7.050& 6.049  & 5.322 & 4.527\\
$\rm ^2G$& 3.260 & 2.959& 3.259& 2.857  & 3.378 & 2.876\\
$\rm ^2P$& 1.018 & 1.121& 1.035& 0.9661 & 1.063 & 0.8726\\
$\rm ^2H$& 2.997 & 2.360& 3.040& 2.632  & 3.442 & 1.969\\
$\rm ^2D$& 2.021 & 1.201& 1.838& 1.274  & 1.746 & 1.369\\
$\rm ^2F$& 1.764 & 1.451& 1.961& 1.536  & 1.842 & 1.467\\
$\rm ^2D2$& 0.637&0.6145&0.697 & 0.6437 & 0.7909& 0.7117\\
            \hline
         \end{tabular}
\end{table}