\begin{table}%t2
%\centering
\par
\caption{SEST {\it FWHM} beam widths and efficiencies at selected
frequencies.\label{effic}}
\begin{tabular}{c cc}
\hline\hline
Frequency & {\it FWHM} & $\eta_{\rm mb}$ \\
{\rm [GHz]} & [$\arcsec$] & \\
\hline
\phantom{0}86&	57	&	0.75    \\
100	&	51	&	0.73	\\
115	&	45	&	0.70	\\
147     &       34      &       0.66    \\		
230	&	23	&	0.50	\\				
265	&	21	&	0.42	\\
345     &       15      &       0.25    \\				
\hline
\end{tabular}
\end{table}