\begin{table}%t2
%\centering
\par
\caption{Slopes of the linear fits to the logarithm of the mean weighted PWTs with
a linear correction for the magnitude of the stars
before averaging. }
%\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 &$ -0.599  \pm 0.019$ &    $-0.506 \pm 0.006$ \\
 G &$ -0.537  \pm 0.016$ &    $-0.372 \pm 0.016$ \\
 K &$ -0.658  \pm 0.018$ &    $-0.581 \pm 0.011$ \\
 M &$ -0.725  \pm 0.016$ &    $-0.567 \pm 0.013$ \\ \hline
\par
\end{tabular}
%\end{center}
\par
\end{table}