\begin{table}%T4
\caption{\label{tab4}Convergence of collision strengths for some transitions of Fe~X. $a\pm b \equiv a\times10^{{\pm}b}$.}

\begin{tabular}{lllllll}
\multicolumn{3}{c}{{\bf (a)} Forbidden transitions.}\\ 
\hline                                                                                                  \hline                                                                                               Transition & \multicolumn{3}{c}{1$-$2} &  \multicolumn{3}{c}{5$-$16} \\ 
\hline
Partial waves & 100 & 150 & 200 & 100 & 150 & 200 ~Ryd \\                                               \hline	     $J \le 9$   & 1.20$-$1  & 9.87$-$2  & 8.43$-$2  & 1.20$-$1  & 9.92$-$2  & 8.46$-$2  \\
+ top-up    & 2.21$-$1  & 4.76$-$1  & 8.74$-$1  & 2.04$-$1  & 2.43$-$1  & 3.22$-$1  \\
$J \le 19$  & 1.82$-$1  & 1.72$-$1  & 1.62$-$1  & 1.83$-$1  & 1.74$-$1  & 1.64$-$1  \\
+ top-up    & 1.90$-$1  & 1.85$-$1  & 1.81$-$1  & 1.97$-$1  & 1.98$-$1  & 1.98$-$1  \\
$J \le 29$  & 1.95$-$1  & 1.91$-$1  & 1.87$-$1  & 1.96$-$1  & 1.93$-$1  & 1.89$-$1  \\
+ top-up    & 1.98$-$1  & 1.96$-$1  & 1.96$-$1  & 2.02$-$1  & 2.02$-$1  & 2.07$-$1  \\
$J \le 39$  & 1.99$-$1  & 1.98$-$1  & 1.96$-$1  & 2.00$-$1  & 1.99$-$1  & 1.97$-$1  \\
+ top-up    & 2.01$-$1  & 2.00$-$1  & 1.99$-$1  & 2.03$-$1  & 2.04$-$1  & 2.04$-$1  \\
\hline
{\bf (b)} Allowed transitions.\\
\hline						Transition & \multicolumn{3}{c}{1$-$28} &  \multicolumn{3}{c}{2$-$3} \\ 
\hline
Partial waves & 100 & 150 & 200 & 100 & 150 & 200 ~Ryd \\                                              \hline	
$J \le$ 9   & 1.83+0  & 1.23$-$0  & 8.78$-$1  & 7.43$-$2  & 4.92$-$2  & 3.48$-$2  \\
+ top-up    & 6.49+0  & 6.35+0  & 6.32+0  & 2.97$-$1  & 2.90$-$1  & 2.88$-$1  \\
$J \le$ 19  & 4.80+0  & 4.13+0  & 3.55+0  & 1.98$-$1  & 1.68$-$1  & 1.45$-$1  \\
+ top-up    & 9.45+0  & 9.25+0  & 8.99+0  & 4.20$-$1  & 4.09$-$1  & 3.98$-$1  \\
$J \le$ 29  & 6.30+0  & 5.82+0  & 5.32+0  & 2.71$-$1  & 2.40$-$1  & 2.17$-$1  \\
+ top-up    & 1.00+1  & 1.07+1  & 1.08+1  & 4.46$-$1  & 4.68$-$1  & 4.71$-$1  \\
$J \le$ 39  & 7.09+0  & 6.89+0  & 6.53+0  & 3.21$-$1  & 2.92$-$1  & 2.70$-$1  \\
+ top-up    & 1.00+1  & 1.07+1  & 1.12+0  & 4.46$-$1  & 4.68$-$1  & 4.88$-$1  \\
\hline						\end{tabular} 
%\vspace*{1mm}
\end{table}