\begin{table}%t3
%\centering
\par
\caption{\label{tab:OMT}Band-averaged cross-polar leakage $\eta$ and effective  rotation~$\delta$ measured for the flight
model OMTs.}
\begin{tabular}{lrrrrrr}
\hline \hline  \noalign{\smallskip}
Feed   & \multicolumn{2}{c}{Side arm} & \multicolumn{2}{c}{Main arm} 
& \multicolumn{2}{c}{Difference\tablefootmark{a}}\\
& $\eta_{\rm s}$ & $\delta_{\rm s}$ & $\eta_{\rm m}$ & $\delta_{\rm m}$
& $\bar{\eta}$ & $\bar{\delta}$ \\ 
LFI- & $10^{-3}$ & \degr & $10^{-3}$ & \degr & $10^{-3}$ & \degr \\ 
\hline
18 & 0.39 & $ 0.02$ & 0.29 & $ 0.97$ & 0.41 & $ 0.49$ \\
19 & 0.46 & $ 0.44$ & 0.40 & $-$1.53 & 0.73 & $-$0.54 \\
20 & 0.10 & $ 0.27$ & 0.18 & $-$0.89 & 0.25 & $-$0.26 \\
22 & 0.26 & $ 0.54$ & 0.36 & $-$1.46 & 0.61 & $-$0.46 \\
23 & 0.34 & $ 0.76$ & 0.34 & $-$1.41 & 0.70 & $-$0.33 \\
        & & & & \\
24 & 0.03 & $ 0.01$ & 0.02 & $-$0.37 & 0.04 & $-$0.18 \\
25 & 0.18 & $-$0.02 & 0.07 & $-$0.75 & 0.16 & $-$0.39 \\
26 & 0.42 & $ 0.95$ & 0.34 & $ 0.83$ & 0.38 & $ 0.89$ \\
        & & & & \\
27 & 0.02 & $-$0.02 & 0.02 & $ 0.40$ & 0.03 & $ 0.19$ \\
28 & 0.04 & $ 0.16$ & 0.06 & $ 0.26$ & 0.05 & $ 0.21$ \\
\hline
\end{tabular}
\tablefoot{Values are weighted by the measured bandpass and the 
differential CMB spectrum. 
\tablefoottext{a}{effective
$\bar{\eta}$ and $\bar{\delta}$ evaluated by integrating over the
difference bandpasses,  ${\cal M}_{QS} = {\cal W}_{\rm s}(\nu)/G_{\rm s} 
- {\cal W}_{\rm m}(\nu)/G_{\rm m}$.}}\vspace*{2.5mm}
\end{table}