\begin{table}%t1
%\centering
\par
 \caption{\label{table}The values of angular parameters for RX   J1856.5-3754.}
 \small
  \begin{tabular}{@{}llrrrrlrl}
  \hline  \hline
   $P_{\rm obs}(s)$    & $P(s)$ & $\Delta \beta$ & $\beta _{0}$ & $\delta$ & $\vartheta$     \\
\hline \noalign{\smallskip}                        % inserts single horizontal line
7.055 & $ 1.5$ & $10^{-4}$ & $2\times 10^{-3}$ & $2\times 10^{-5}$ & $10^{-3}$ \\      
\hline
\end{tabular}
\end{table}