\begin{table}%[htb]%t2
\par
%\centering
\par
\caption{Results of the CO$_2$ calculations (IR intensities in
kilometres/mole shown in parentheses). Experimental values
are from Lide (\cite{Lide92}). OOP means "out of plane".\label{co2_1}}
\begin{tabular}{c c c c c}\hline\hline
Method & 	Bend (in-plane)	& Bend (OOP)	& Stretch (sym)	& Stretch (antisym) \\
 	 & (cm$^{-1}$)	 & (cm$^{-1}$)	& (cm$^{-1}$)	& (cm$^{-1}$) \\
\hline
Experimental	& 667	& 667	& 1333	& 2349  \\
RHF/STO-3G	& 566.06 (34.0)	& 566.06 (34.0)	& 1435.44 (0.0)	& 2536.18 (342.3)  \\
RHF/6-31G	& 656.54 (67.2)	 & 656.54 (67.2)	& 1407.50 (0.0)	& 2374.57 (918.8)  \\
MP2/6-31G	& 520.42 (16.4)	& 520.42 (16.4)	& 1227.14 (0.0)	& 2292.81 (382.9)  \\
MP2/6-31++G	& 451.17 (17.3)	& 451.17 (17.3)	& 1213.84 (0.0)	& 2236.91 (507.6)  \\
MP2/6-31++G* &	655.12 (24.7)	& 655.12 (24.7)	& 1335.54 (0.0)	& 2432.90 (603.94)  \\
MP4/6-31++G	& 436.67 (0.0)	& 436.67 (0.0)	& 1095.04 (0.0)	& 2130.88 (0.0)   \\
B3LYP/6-311++G	& 540.85 (28.27)	& 540.85 (28.27)	& 1269.74 (0.0)	& 2231.90 (580.84)  \\
B3LYP/6-311++G* &	668.59 (33.1)	& 668.59 (33.1)	& 1372.96 (0.0)	& 2420.02 (711.6)  \\
 \hline
\end{tabular}
\end{table}