\begin{table}%T1
\caption{\label{t1}Derived parameters for Forbush decrease for the 2001 April 11 event.}
%\centerline
 {
\begin{tabular}{llllllllll}
\hline\hline
Quantity & NW & N & NE & W & V & E & SW & S & SE\\
\hline
FD magnitude & 2.51 & 2.51 & 1.87 & 2.92 & 2.71 & 2.04 & 2.58 & 2.37 & 1.79 \\
FD onset & 15:36 & 17:31 & 19:26 & 10:05 & 11:45 & 16:19 & 06:58 & 09:22 & 12:45\\
FD end$^1$ & 15:07 & 13:55 & 12:43 & 12:57 & 12:43 & 11:45 & 09:36 & 11:02 & 11:17\\
$\sigma^{2}$ (Kolmogorov) & 0.02 & 0.02 & 0.02 & 0.02 & 0.02 & 0.02 & 0.02 & 0.02 & 0.02\\
\hline
\end{tabular}}
\medskip
$^1$ The FD end times refer to 2001 April 12.
\end{table}