\begin{table}%f5
%\centering
\par
\caption{Parameters $A_{1}$ (in arbitrary units) and $\tau_{1}$ (in seconds), related to the granular contrast
and its characteristic lifetime,
obtained from  the weighted
average PWTs.
 }
%\begin{center}
\par
\begin{tabular}{c c c} \hline \hline\noalign{\smallskip}
 Spectral & $\tau_{1}$ & $A_{1} $  \\
  type   & s    &   arbitrary units \\ \hline
 F       & 500 &  13.81  $\pm$ 0.29  \\
 G       & 500 &  17.56  $\pm$ 0.29   \\
 K       & 580 &  20.41  $\pm$ 0.11   \\
 M       & 620 &  29.49  $\pm$ 0.31   \\ \hline
\par
\end{tabular}
%\end{center}
\par
\end{table}