\begin{table}%t2
\caption{The technical characteristics of the CCDs.}\label{tab2}
%\centering
\small
\begin{tabular}{ccc}
\hline\hline
CCD description                          & Image size         & Pixel size         \\
\hline
EEV CCD02-06-1-206  &  385 $\times$  578 pixels & 22 $\times$ 22 $\mu$m     \\
EEV CCD-05-20-0-202 &  770 $\times$ 1152 pixels & 22,5 $\times$ 22,5 $\mu$m \\
SITe SI003AB        & 1024 $\times$ 1024 pixels &  24 $\times$ 24 $\mu$m    \\
\hline
\end{tabular}
\end{table}