\begin{table}%t2
\caption {\label{tab:coor_sys}Main beam frames.}
$$
 {\begin{tabular}{c c r@{.}l r@{.}l r@{.}l r@{.}l r@{.}l r@{.}l}
\hline\hline
\noalign{\smallskip}
B{\sc eam} & $\nu_0$ & \multicolumn{2}{c}{$\theta_{\rm MB}$} & \multicolumn{2}{c}{$\phi_{\rm MB}$} & \multicolumn{2}{c}{$\psi_{\rm MB}$} & \multicolumn{2}{c}{$U_{\rm MB}$} & \multicolumn{2}{c}{$V_{\rm MB}$} \\
& (GHz) & \multicolumn{2}{c}{($^\circ$)} & \multicolumn{2}{c}{($^\circ$)} & \multicolumn{2}{c}{($^\circ$)} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} \\
\hline
18 & 70 & 3&2975 & --131&8147 &   22&3 & --0&03835 & --0&04287 \\
19 & 70 & 3&1750 & --150&8570 &   22&4 & --0&04837 & --0&02697 \\
20 & 70 & 3&1649 & --168&4438 &   22&4 & --0&05409 & --0&01106 \\
21 & 70 & 3&1649 &   168&4438 & --22&4 & --0&05409 &   0&01106 \\
22 & 70 & 3&1747 &   150&8570 & --22&4 & --0&04837 &   0&02697 \\
23 & 70 & 3&2975 &   131&8147 & --22&3 & --0&03835 &   0&04287 \\
24 & 44 & 4&0536 &   180&0000 &     0&0 & --0&07069 &   0&00000 \\
25 & 44 & 5&0186 &    61&1350 & --113&5 &   0&04223 &   0&07661 \\
26 & 44 & 5&0186 &  --61&1350 &   113&5 &   0&04223 & --0&07661 \\
27 & 30 & 4&3466 &   153&6074 & --22&5 & --0&06789 &   0&03369 \\
28 & 30 & 4&3466 & --153&6074 &   22&5 & --0&06789 & --0&03369 \\
\hline
\end{tabular}}
$$
\tablefoot {$\theta_{\rm MB}$, $\phi_{\rm MB}$, and $\psi_{\rm MB}$ angles defining the coordinate systems, with respect to the LOS frame, in which each main beams was computed. $\theta_{\rm MB}$ and $\phi_{\rm MB}$ indicate the main beam locations on the sky ($U_{\rm MB} = \sin \theta_{\rm MB} \times \cos \phi_{\rm MB}$ and $V_{\rm MB} = \sin \theta_{\rm MB} \times \sin \phi_{\rm MB}$ reported in the last two columns) and $\psi_{\rm MB}$ is the polarization angle.}
\end{table}