\begin{table}%t5
%\centering
\small
\caption{Fit of the magnitude uncertainty as a function of magnitude
deduced from the common areas. This
was used to compute uncertainties for individual galaxies: Uncertainty =
slope $\times$ magnitude + constant term.}\label{tab:fit}
\begin{tabular}{llll}
\hline\hline
Magnitude band & validity domain & slope & constant term \\
\hline
$B$       & [20,25.5] & 0.0340 & $-$0.5933 \\
$V$       & [20,24.5] & 0.0445 & $-$0.8352 \\
$R$       & [20,24] & 0.0420 & $-$0.7410 \\
$I$       & [20,23.5] & 0.0657 & $-$1.1772 \\
\hline
\end{tabular}
\end{table}