\begin{table}%t3
\par
\caption {Preliminary classification of the candidates with $J$-band \mbox{photometry}.
  \label{results}}
%\centerline
 {\begin{tabular}{cccccc} \hline\hline
 &T dwarfs & L dwarfs & quasars  & M dwarfs & artefacts \\ \hline  
Number of & 23 &57 & 4 & 109   & 22 \\  
objects &   &  &   &    &  \\ \hline
Percentage& 10.7\%& 26.5\%&1.9\%&50.7\%&10.2\%\\ \hline
\end{tabular}}
\par
\smallskip
 This classification is based on their position in the $i'-z'$ versus $z'-J$ colour-colour diagram.
\end{table}