\begin{table}%t7
%\centering
\par
\caption{\label{beamperf}Telescope beam performances: from simulations assuming perfect optical components.}
\begin{tabular}{cccc}
\hline\hline
\noalign{\smallskip}
Detection & Beam width & Ellipticity & Polarisation angle\\
assembly & (arcmin) & & on sky (deg) a\&b \\
\hline
100-1 a\&b & 9.6 & 0.14 & 22.5/$-$67.5\\
100-2 a\&b & 9.6 & 0.14 & 45.0/$-$45.0\\
100-3 a\&b & 9.6 & 0.14 & 0.0/$-$90.0\\
100-4 a\&b & 9.6 & 0.14 & $-$22.5/67.5\\
143-1 a\&b & 7.0 & 0.12 & 45.1/$-$44.9\\
143-2 a\&b & 7.0 & 0.07 & 45.0/$-$45.0\\
143-3 a\&b & 7.0 & 0.07 & 0.0/$-$90.1\\
143-4 a\&b & 7.0 & 0.12 & $-$0.1/$-$90.2\\
143-5\&-8  & 7.2 & 0.07 & Not polarised\\
143-6\&-7  & 7.1 & 0.05 & Not polarised\\
217-1\&-4  & 5.0 & 0.14 & Not polarised\\
217-2\&-3  & 4.8 & 0.12 & Not polarised\\
217-5 a\&b & 4.7 & 0.12 & 45.1/$-$44.9\\
217-6 a\&b & 4.5 & 0.09 & 45.1/$-$45.0\\
217-7 a\&b & 4.5 & 0.09 & $-$0.1/$-$90.0\\
217-8 a\&b & 4.7 & 0.12 & $-$0.1/$-$90.1\\
353-1\&-8  & 4.6 & 0.2  & Not polarised\\
353-2\&-7  & 4.5 & 0.1  & Not polarised\\
353-3 a\&b & 4.8 & 0.09 & 45.1/$-$44.9\\
353-4 a\&b & 4.8 & 0.05 & 45.0/$-$45.0\\
353-5 a\&b & 4.8 & 0.07 & 0.0/$-$90.0\\
353-6 a\&b & 4.8 & 0.12 & $-$0.1/$-$90.1\\
\hline
\end{tabular}
\tablefoot{Computations were performed at the central frequency of each spectral band following Eqs.~(\ref{comp1}) and~(\ref{comp2}).}
\end{table}