\begin{table}%t1
%\centering
\par
\caption{\label{tab:ctrate}Hardness ratios and count rates of the studied sources. }
\vspace*{-1.5mm}
\begin{tabular}{lccccc}
\hline\hline
\noalign{\smallskip}
Source & MOS1 & MOS2 & pn & $HR_1$& $HR_2$\\
& cts~s$^{-1}$ & cts~s$^{-1}$ & cts~s$^{-1}$ & &  \\
\hline
\hd       & $0.070\pm 0.002$ & $0.069\pm 0.002$ & $0.311\pm 0.003$   & $-0.63\pm 0.02$ & $-0.94\pm 0.03$ \\
HD~155889&   & $0.032\pm 0.002$ &  & $-0.28 \pm 0.05$ & $-0.44\pm 0.09$ \\
1RXS      & $0.464 \pm 0.004$   & $0.484\pm 0.004$   & $1.743\pm 0.008$   & $-0.16\pm 0.01$ & $-0.56\pm 0.01$ \\
\hline
\end{tabular}
\vspace*{-1.5mm}
\end{table}