\begin{table}%t2
%\centering
\par
\caption{Galaxy contamination  of the D1 field cross-identified with the VVDS field as a function of $i'$ magnitude
and $r'-i'$ colour. The common area is $\sim$0.4~sq degree.\label{contamination}}
\begin{tabular}{cccc}
\hline\hline
 $r'-i'$ & $i' < 20.0$&$i'< 21.0$&$i' < 22.0$\\
\hline
 total &$3.2\% \pm 1.8$ & $6.7\% \pm 1.9$   & $13.1\% \pm 2.3$\\
 $<$$ 0.5$&  $3.2\% \pm 3.2$   & $13.0\%  \pm 4.3$   & $23.5\% \pm 4.9$ \\
$> $$0.5$& $3.1\% \pm 2.2$ &$ 2.7\% \pm 1.5$ & $6.5\% \pm 2.1$ \\
$ >$$ 1.4$& 0\%    &      0\% &    $  1.8\%\pm 1.8$ \\
\hline
\end{tabular}
\end{table}