\begin{table}%T1
%\centering
\par
\caption{Molecular data.}
\begin{tabular}{ll}
\hline\hline
$A$ (MHz) &  34~638.7013\\
$B$ (MHz) & 3424.87684\\
$C$ (MHz) & 3113.63865\\
$\Delta_J$ (MHz) & $2.888 \times 10^{-4}$\\
$\Delta_{JK}$ (MHz) & $2.952 \times 10^{-2}$\\
&\\
$\mu_a$ (Debye) & 2.04\\
$\mu_b$ (Debye) & 2.89\\
\hline
\end{tabular}
\end{table}