\begin{table}%t4
\caption{\label{tab4}Specifications of the feed horns.}
\par
%\centering
\par
\begin{tabular}{p{4.5cm}ccc}
\hline\hline\noalign{\smallskip}
 &30 GHz&44 GHz&70 GHz \\
\hline
Band [GHz] \dotfill &27--33&39.6--48.4&63--77 \\
Return loss [dB] \dotfill &$<$$-25$&$<$$-25$&$<$$-25$ \\
Insertion loss at 20~K [dB]  \dotfill &$-$0.1&$-$0.1&$-$0.1 \\
Edge taper at 22$^\circ$~[dB] \dotfill &30&30&25 \\
Sidelobes [dB] \dotfill &$<$$-35$&$<$$-35$&$<$$-35$ \\
Cross polarisation [dB] \dotfill &$<$$-30$&$<$$-30$&$<$$-30$ \\
\hline
\end{tabular}
\end{table}