\begin{table}%t1
%\centering
\par
\caption{Radial velocity parameters of Cen X-4.\label{cross}}
\begin{tabular}{ccccc}
\hline\hline
Template star &  Spectral type &   $\gamma$     &   $K_2$       &${\chi^2}_{\rm red}$\\
         &                & (km s$^{-1}$)  & (km s$^{-1}$) &\\ 
\hline
HR 5536    &  K3 III      & $203.6\pm 2.1$  & $147.7\pm 1.0$&1.8\\
HD 184467  &  K2 V        & $191.2\pm 2.1$  & $147.6\pm 0.9$&1.9\\
HD 29697   &  K3 V        & $209  \pm 10 $  & $146.1\pm 1.0$&1.2\\
HD 154712A &  K4 V        & $194.2\pm 2.1$  & $146.2\pm 0.8$&1.7\\
61 Cyg A   &  K5 V        & $196.4\pm 1.0$  & $146.4\pm 0.8$&1.9\\
61 Cyg B   &  K7 V        & $196.0\pm 1.1$  & $145.8\pm 1.0$&1.1\\
\hline
\end{tabular}
\end{table}