\begin{table}%t8
%\centering
\par
\caption{\label{mmres}$FWHM$ and HPBW estimated from two beam cuts through the centroid of the
unweighted beams of some of the multi-mode pixels.}
\begin{tabular}{ccc}
\hline\hline
\noalign{\smallskip}
Detection & $FWHM$ & HPBW \\
assembly & (arcmin) & (arcmin)\\
\hline
545-2 & $4.85 \times 4.69$ & $3.74 \times 3.36$\\
857-1 & $5.05 \times 4.84$ & $3.67 \times 3.45$\\
857-2 & $4.97 \times 4.96$ & $3.57 \times 3.49$\\
\hline
\end{tabular}
\tablefoot{Broad-band beams have been constructed from 68 frequencies for the 545~GHz
channel and 52 frequencies for the 857~GHz one.}\vspace*{2mm}
\end{table}