\begin{table}%t2
%\centering
\par
\caption{\label{quasnum}Parameters for the quasiperiodic signal.}
\small \begin{tabular}{c c c c c c c c }
\hline\hline
$a_1$ & $a_2$ & $a_3$ & $f_1$ & $f_2$ & $f_3$ & $\sigma$ & $\overline{x}$ \\ 
\hline
0.4 &0.6 & 0.5 & $\sqrt{5}$ & $\sqrt{3}$ & $\sqrt{2}$ & 0.1 & 0\\
\hline
\end{tabular}
\end{table}