\begin{table}%t1
\caption{\label{pol}Parameters of the total intensity and polarization images.}
\small%\centering
\par
\begin{tabular} {c c c c c c c c}  %8 columns 
\hline\hline\noalign{\smallskip}
$\nu$    & Bandwidth & \multicolumn{3}{c} {1.25 arcsec} & \multicolumn{3}{c} {5.5 arcsec} \\  
         &      & $\sigma_{I}$ & $\sigma_{QU}$ & $\langle p \rangle$ & $\sigma_{I}$ & $\sigma_{QU}$ & $\langle p \rangle$ \\ 
 (GHz)   &   (MHz)   &  (mJy/beam)   & (mJy/beam)  & & (mJy/beam)   & (mJy/beam) &  \\  
\hline     
1.365 & 12.5 & 0.037  & 0.030 & 0.24 & 0.018 & 0.014  & 0.26 \\
1.445 & 12.5 & 0.021  & 0.020 & 0.25 & 0.020  & 0.011  & 0.27  \\
1.465 & 12.5 & 0.048  & 0.049 & 0.25 & 0.019 & 0.013  & 0.25 \\
1.485 & 12.5 & 0.035  & 0.027 & 0.21 & 0.014 & 0.010  & 0.26 \\
4.685 & 50.0 & 0.017  & 0.017 & 0.32 & 0.017 & 0.013  & 0.37    \\
4.985 & 50.0 & 0.018  & 0.017 & 0.33 & 0.017 & 0.016  & 0.39  \\
8.385 & 100.0 & 0.014 & 0.011 & 0.31 & 0.015 & 0.013  & $-$    \\ 
\hline\end{tabular}
\tablefoot{Column~1: observation frequency. Column~2:~bandwidth (note that the images at 8.385~GHz are
derived from the average of two frequency  channels, both with bandwidths of 50~MHz,
centred on 8.285 and 8.485~GHz); Cols.~3,~4 : rms noise levels in total intensity ($\sigma_{I}$) 
and linear polarization ($\sigma_{QU}$, the average of
$\sigma_{Q}$ and $\sigma_{U}$) at 1.25~arcsec {\it FWHM} resolution; Col.~5: mean degree of polarization at   1.25~arcsec; Cols.~6,~7:~rms noise levels for the 5.5~arcsec images; Col. 8: mean degree of polarization at 5.5~arcsec. We estimate that  
the uncertainty in the degree of polarization, which is 
dominated by systematic deconvolution errors on the $I$ images, is $\approx$0.02  at each frequency.} 
\end{table}