\begin{table}%t2
\caption{\label{table:opt1}LFI optical performance.}
%\centering
\par
\begin{tabular}{l c c c c c c c}
\hline\hline\noalign{\smallskip}
 &  ET & {\it FWHM}  & $e$  & XPD & Ssp & Msp \\
\hline
70 &$17$~dB at $22^\circ$ &13.03&1.22&$-$34.73&0.17 & 0.65  \\
44 &$30$~dB at $22^\circ$ &26.81&1.26&$-$30.54&0.074& 0.18 \\
30 &$30$~dB at $22^\circ$&33.34&1.38&$-$32.37&0.24 & 0.59 \\
\hline
\end{tabular}
\tablefoot {All the values are averaged over all channels at the same frequency. ET~is the horn edge taper measured at~$22^{\circ}$ from the horn axis; {\it FWHM} is the angular resolution in arcmin; $e$~is the ellipticity; XPD is the cross-polar discrimination in~dB; Ssp~is the Sub-reflector spillover~(\%); Msp~is the Main-reflector spillover~(\%). See~text for~\mbox{details}.}
\vspace{2.5mm}\end{table}