\begin{table}%t2
\caption{\label{tab1}Parameters of the MOLSCAT calculations.}            
\small
 %\centering
\par
\begin{tabular}{ c  c  c  }  
\hline\hline
 & Number of $J$ levels & Number of $J$ levels\\                      
Energy (cm$^{-1}$) & leading to open channels &  included in the calculation\\ 
\hline
50 & 8 & 15 \\ 
100 & 11 & 17  \\
200 & 16 & 21  \\
400 & 22 & 27 \\ 
600 & 27 & 31 \\
800 & 31 & 33 \\
2000 & 31 & 33 \\
\hline                                 
\end{tabular}
\end{table}