\begin{table}%t1
    \caption{\label{tabplates}List of DPOSS plates from which we extracted our catalogues.
   Notes: (1) calibration from Paolillo et~al. (\cite{pao01}); (2)~calibration from
Paolillo et~al. (\cite{pao02}).}
%%\centering
\par
   \begin{tabular}{cccc}
 \hline\hline\noalign{\smallskip}
{  Plate  } & {   RA   } & {   Dec   } & {Effective area}\\
{   Num   } & { (2000) } & { (2000)  } & {  (deg$^{2}$) }\\
\noalign{\smallskip}\hline\noalign{\smallskip}
610$^{(1)}$ & 01:00 & +15.0 &  30.0\\
680$^{(1)}$ & 00:20 & +10.0 &  37.8\\
682$^{(1)}$ & 01:00 & +10.0 &  38.7\\
688$^{(1)}$ & 03:00 & +10.0 &  38.5\\
693$^{(1)}$ & 04:40 & +10.0 &  30.2\\
752$^{(1)}$ & 00:20 & +05.0 &  32.0\\
755$^{(1)}$ & 00:20 & +05.0 &  24.3\\
757$^{(1)}$ & 01:20 & +05.0 &  24.6\\
827$^{(2)}$ & 01:20 & +00.0 &  10.1\\
829$^{(1)}$ & 02:00 & +00.0 &  24.6\\
\noalign{\smallskip}\hline
\end{tabular}
   \end{table}