\begin{table}%t1
\caption{Vibrational matrix elements ($\langle v'(r) \mid (r-r_{\rm e})^{n-1} \mid v''(r) \rangle$) used in the vibrational averaging of the interaction potential; $r_{\rm e}$ was taken to be 2.8 bohr.}
\label{tab1}
%\centering
\par
\begin{tabular}{cc | ccc}
\hline\hline
$v'$ & $v''$ & $n=1$ & $n=2$ & $n=3$ \\
\hline
0 & 0 &1.00000 & 0.03531& 0.00628\\
0 & 1 & 0.00000&0.07084& 0.00580\\
1 & 1 &1.00000&0.05227& 0.01790\\
\hline
\end{tabular}
\end{table}