\begin{table}%t2
%\centering
\par
\caption{\label{tab2}Parameters of the break frequencies of the power spectra of the studied sources.}
\begin{tabular}{lc}
\hline\hline
Source & $f_{\rm break} \times $ Period\\
\hline
XSS 00564+4548	&$0.7\pm0.2$\\
IGR J00234+6141	&$1.0\pm0.3$\\
DO Dra		&$0.5\pm0.1$\\
V1223 Sgr	&$16\pm4$\\
IGR J15094-6649	&$1.3\pm0.3$\\
IGR J16500-3307	&$1.5\pm0.2$\\
IGR J17195-4100	&$2.0\pm0.3$\\
\hline
\end{tabular}
\end{table}