\begin{table}%t3
%\centering
\par
\caption{Slopes of the linear fits to the logarithm of the mean weighted PWTs
leveling up all the stars of each spectral
type to have the same level of noise above 3 mHz. }
%\begin{center}
\par
\begin{tabular}{c c c} \hline \hline\noalign{\smallskip}
 Spectral & Slope from $1.0\times 10^{-4}$ & Slope from $0.7\times 10^{-3}$ \\
 type & to $0.6\times 10^{-3}$ Hz  & to $2.5\times 10^{-3}$ Hz \\ \hline
 F & $-0.604  \pm 0.019 $&    $ -0.510\pm 0.006 $\\
 G & $-0.582  \pm 0.016 $&    $ -0.431\pm 0.007 $\\
 K & $-0.644  \pm 0.019 $&    $ -0.558\pm 0.010 $\\
 M & $-0.695  \pm 0.014 $&    $ -0.563\pm 0.011 $\\ \hline
\par
\end{tabular}
%\end{center}
\par
\end{table}