\begin{table}%t2
\caption{Lorentzian parameters of the detected QPOs.}\label{tab2}
%\centering
\par
\begin{tabular}{lcccccc}
\hline
\hline
Obs. &  \multicolumn{3}{c}{Narrow peak}                      & \multicolumn{3}{c}{Broad peak}                   \\
\hline
     &  $\nu_0$ (Hz)   & $\Delta$ (Hz) & rms                 & $\nu_0$ (Hz) & $\Delta$ (Hz) & rms               \\
\hline
A    &   7.28 $\pm$ 0.03 & 0.16 $\pm$ 0.03 & 10.64 $\pm$ 0.61\%    & 7.02 $\pm$ 0.09& 1.97 $\pm$ 0.31 & 7.73 $\pm$ 0.52\%   \\
B    &   5.73 $\pm$ 0.05 & 0.14 $\pm$ 0.05 &  9.21 $\pm$ 1.14\%    & 6.01 $\pm$ 0.05& 1.20 $\pm$ 0.16 & 7.01 $\pm$ 0.38\%   \\
\hline
\end{tabular}
\end{table}