\begin{table}%T2.
%\centering
\par
\caption{Effective collision strengths for Ni{\sc ii} at 10~000~K
for transitions
from the ground and first excited states.} \label{t2}
\begin{tabular}{@{}cccccccc} 
\hline\hline 
Transition& $E$1   &    $E$2  &    $E$3 &     $E$4 &    $E$5  & $E$6 &  Watts \\
\hline 
1 $\to$ 2 &   5.76  &  7.47  &  3.47 &   6.97  & 5.76 &  4.68  &   4.84 \\
1 $\to$ 3 &   4.24  &  4.39  &  3.24 &   4.64  & 3.81 &  3.45  &   3.05 \\
1 $\to$ 4 &   3.28  &  2.62  &  2.17 &   3.10  & 2.23 &  2.10  &   1.98 \\
1 $\to$ 5 &   2.98  &  3.00  &  5.00 &   3.19  & 2.36 &  2.25  &   1.30 \\
1 $\to$ 6 &   1.56  &  1.59  &  1.44 &   1.68  & 1.61 &  1.21  &   1.05 \\
1 $\to$ 7 &   2.78  &  2.96  &  2.48 &   2.30  & 2.42 &  2.26  &   1.62 \\
2 $\to$ 3 &  24.99  & 26.50  & 26.62 &  29.67 & 31.06 & 15.48  &  \\
2 $\to$ 4 &   4.41  &  4.91  &  4.95 &   4.28  & 4.64 &  5.37  & \\
2 $\to$ 5 &   1.87  &  2.17  &  2.01 &   1.45  & 1.72 &  1.19  & \\
2 $\to$ 6 &   0.795 &  0.746 &  0.820&   0.65  & 0.795&  1.27  & \\
2 $\to$ 7 &   1.78  &  2.00  &  1.99 &   1.63  & 1.92 &  1.84  & \\
\hline 
\end{tabular}
\end{table}