\begin{table}%t1
%\centering
\par
\caption{Statistics of spectral peculiar A-stars.}\label{tab1}
\begin{tabular}{ccccc}
\hline\hline\noalign{\smallskip}
                   &  Total  &  X-ray           &  Known           &  Binaries among\\
                   &         &  detected        &  binaries        &  X-ray detections \\
\hline
A-type stars       &  1966   &   312 (16\%)     &     733 (37\%)   &   194 (62\%)   \\
Am                 &   212   &    41 (19\%)     &      89 (42\%)   &    34 (83\%)   \\
Ap                 &   133   &    18 (14\%)     &      51 (38\%)   &     8 (44\%)   \\
A giants           &   474   &    62 (13\%)     &     179 (38\%)   &    35 (56\%)   \\
\hline
\end{tabular}
\end{table}