\begin{table}%t1
\caption{Events with U-type pulses. Flux -- pulse amplitude at
the SSRT receiving frequency, $\Delta f$ -- total width of the
U-burst spectrum, $\Delta f_{\rm ins}$ -- instantaneous
bandwidth, $\partial f/\partial t$ -- drift velocities of
different branches are shown sequentially, $\tau_{\rm tot}$ --
total duration, $\tau_{\rm ssrt}$ -- interval between the
recording of the U-structure branches at the SSRT frequency.}
\label{Tab1}
%\centering
\par
\begin{tabular}{lllllll}
\hline\hline
Date & Time & Flux, sfu &
$\Delta f/\Delta f_{\rm ins}$,~GHz & $\partial f/\partial t$,~GHz/s &
$\tau_{\rm tot}$/$\tau_{\rm ssrt}$, s \\
\hline
2000/06/02 & 03:42:26.2 & 8 & 0.45/0.25 & $2.0$ & 0.45/0.22 &  \\
&  &  &  & $-4.4$ &   \\
&  &  &  & $1.2$ &   \\
2001/03/30 & 05:12:55.9 & 0.1 & 1.0/0.22 & $-5.9$ & 0.42/0.27 \\
&  &  &  & $5.9$ &   \\
2001/03/30 & 05:13:24.7 & 0.1 & 0.7/0.3 & $-8.6$ & 0.15/0.1 \\
&  &  &  & $7.5$ &  \\
2001/09/17 & 08:20:58.2 & 180 & 0.2/0.05 & $-4.4$ & 0.07/0.05 \\
&  &  &  & $7.0$ &  \\
\hline
\end{tabular}
\end{table}