\begin{table}%T3
\caption{\label{noises}Parameters of the observations and of the final full
resolution~maps.}
\smallskip
%\centerline
{
\begin{tabular}{ccccccc}
\hline
\hline
\noalign{\smallskip}
Wavelength           &   Full resolution   &   Largest detectable structure   &      ${\sigma_{\rm F}}^a$  &   ${\sigma_{\rm th}}^b$   &   ${\sigma_{\rm conf_{\rm center}}} ^c$  &   ${\sigma_{\rm obs_{\rm center}}} ^d$  \\  
                     &    ${\arcsec}$      &          $^{\prime}$             &                         &     mJy/beam      &       mJy/beam             &           mJy/beam                    \\
 \hline
 2~m                  &    163~$\times$~181  &             191                  &         5\%             &        0.85       &            3               &            3.1                        \\
 \hline
 85~cm                &     54~$\times$~64    &              81                  &         1\%             &        0.05       &            0.25            &            0.25                        \\
 \hline
 25~cm                &     14~$\times$~15   &               24                  &         1\%             &        0.010      &            0.008           &            0.012                        \\
 \hline
\end{tabular}} 
 \smallskip
 {$^a$ Flux scale uncertainty.}\\
 {$^b$ Thermal noise, constant over the~maps.}\\
 {$^c$ Confusion noise.}\\
 {$^d$ Observed noise at the pointing position.}
\end{table}