\begin{table}%t1
%\centering
\par
\caption{\label{tab1}Magnitude ranges and means in the $I$~filter, and
relative to absolute corrections in milliarcseconds as found from the
Mendez \& van Altena galaxy model.}
  %\centering
\par
\begin{tabular}{ccccc}
\hline  \hline \noalign{\smallskip}
Field   & $I_{\rm min}$ & $I_{\rm max}$ & $<I_{\rm w}>$ & RAC \\
 \noalign{\smallskip}\hline \noalign{\smallskip}   
0322$-$019 & 11.21 &  15.88 & 14.37  & 2.0  \\ 
0423$+$120 & 12.05 &  15.81 & 14.69  & 1.3  \\ 
1126$+$185 & 11.80 &  15.90 & 14.49  & 2.1  \\ 
1716$+$020 & 10.97 &  14.76 & 12.95  & 1.2  \\ 
1840$-$111 & 9.650 &  14.43 & 12.88  & 0.4  \\ 
2216$+$484 & 10.39 &  15.48 & 14.13  & 0.8  \\ 
\hline  
\end{tabular}
\end{table}