\begin{table}%t1
%\centering
\par
\caption{\label{normalmodes}Normal mode frequencies [cm$^{-1}$] of methane calculated at the global minimum on the PES compared with Molpro RCCSD(T)/aug-cc-pvtz normal mode frequencies at the {ab~initio} optimized equilibrium geometry.}
\small \begin{tabular}{lll}
\hline \hline
Mode & PES & Molpro\\
\hline
$n_1$ & 3028.87 & 3027.43\\
$n_2$ & 1551.44 1551.53 & 1573.19 1573.58\\
$n_3$ & 3156.30 3156.30 3156.31 & 3146.39 3146.41 3146.41\\
$n_4$ & 1343.34 1343.45 1343.45 & 1350.01 1350.47 1350.47\\
\hline
\end{tabular}
\end{table}