\begin{table}%t8
%\centering
\par
\caption{Ratios of the parameters $A_{1}$ (obtained at maximum and minimum of
the solar activity) and $A_{2}$. These parameters are related with the granular
and super-granulation contrast,
obtained from a non-linear fit of Eq.~(1) to the solar PWTs.
}
%\begin{center}
\par
\begin{tabular}{c c c} \hline \hline
  Filters and    & $A_{1}$          & $A_{2}$          \\
 activity        & $\tau_{1}=210$ s & $\tau_{2}=28$ h \\ \hline
 B (Max)/ B (Min) & $0.996 \pm 0.04$ & $2.62  \pm  2.25$ \\  
 G (Max)/ G (Min) & $0.978 \pm 0.04$ & $2.34  \pm  1.70$ \\  
 R (Max)/ R (Min) & $0.976 \pm 0.35$ & $1.40  \pm  4.41$ \\ \hline
\par
\end{tabular}
%\end{center}
\par
\end{table}