\begin{table}%t5
  \caption{Maximum offset fluctuation $\Delta(Q+jU)$ in one orbit (90~min) induced by the horn temperature instabilities for the SPOrt experiment. The cases of  the~22 and 90~GHz channels       are reported, representing the best and worst cases among the SPOrt receivers. Details about horn temperature fluctuations~($\Delta T_{\rm ph}^{\rm h}$) and antenna characteristics are also listed: horn attenuation~($A_{\rm h}$), OMT~isolation~($|S_{B1}|^2$), polarizer differential attenuation   ($A_{\perp}-A_{\parallel}$), $S\!P_{\rm omt}$ and $S\!P_{\rm pol}$ coefficients, and the~$H_{\rm h}$ transfer function. $S\!P_{\rm omt}$ has been estimated with the approximation $S\!P_{\rm omt} \sim 2\; A_{\rm omt}|S_{A1}S_{B1}^*|$ as described in Carretti et~al. (\cite{ca01}). The case of a~3~K~variation is also shown, that is the natural horn temperature fluctuation without active control.}\label{hornFluctTab} 
%\centering
\par
  \begin{tabular}{@{}lccccccccc@{}}
     \hline  \hline
     Configuration     & $\nu$ & $\Delta T_{\rm ph}^{\rm h}$ & 
     $A_{\rm h}$  & $|S_{B1}|^2$  & 
     $A_{\perp}-A_{\parallel}$  & $S\!P_{\rm omt}$  &
     $S\!P_{\rm pol}$ & $H_{\rm h}$ & $\Delta(Q+jU)$  \\
             & [GHz] &  [K] & 
      [dB] &  [dB] & 
      [dB] &    &    &    &
      [$\mu$K]  \\
     \hline
     22 GHz       & 22     &  $\pm$$0.2$  & 0.05 & --65 & --33 
      & $1.15\times 10^{-3}$  & $2.45\times 10^{-4}$ & $2.40\times 10^{-5}$ & 
     4.8\\
     90 GHz       & 90     &  $\pm$$0.2$  & 0.1  & --60 & --30 
      & $2.05\times 10^{-3}$  & $4.89\times 10^{-4}$ & $8.75\times 10^{-5}$ &
     17.5\\
     22 GHz (3~K) & 22     &  $\pm$$3$    & 0.05 & --65 & --33 
      & $1.15\times 10^{-3}$  & $2.45\times 10^{-4}$ & $2.40\times 10^{-5}$ & 
     72.0\\
     90 GHz (3 K) & 90     &  $\pm$$3$    & 0.1  & --60 & --30 
      & $2.05\times 10^{-3}$  & $4.89\times 10^{-4}$ & $8.75\times 10^{-5}$ &
     262.0\\
     \hline
\end{tabular}
\end{table}