\begin{table}%t1
%\centering
\par
\caption{Summary of the occultation observations.}
\label{table_sum}
\begin{tabular}{ccrrrrr}
\hline
\hline
\multicolumn{1}{c}{(1)} &
\multicolumn{1}{c}{(2)} &
\multicolumn{1}{c}{(3)} &
\multicolumn{1}{c}{(4)} &
\multicolumn{1}{c}{(5)} &
\multicolumn{1}{c}{(6)} &
\multicolumn{1}{c}{(7)} \\
%\multicolumn{1}{c}{(8)} \\
%\multicolumn{1}{c}{Obs.} &
\multicolumn{1}{c}{Date} &
\multicolumn{1}{c}{Event} &
\multicolumn{1}{c}{PA} &
\multicolumn{1}{c}{$D$} &
\multicolumn{1}{c}{$\Delta$$t$ } &
\multicolumn{1}{c}{$\tau$ } &
\multicolumn{1}{c}{$\lambda$ } \\
%                        &
\multicolumn{1}{c}{UT}  &
                        &
\multicolumn{1}{c}{$\degr$}  &
\multicolumn{1}{c}{$\arcsec$}  &
\multicolumn{1}{c}{ms} &
\multicolumn{1}{c}{ms} &
\multicolumn{1}{c}{$\mu$m} \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
 05-02-98 &  D & 352 & 21 & 1.42 & 1.01 & 2.2\\
 06-11-98 &  D &  95 & 14 & 2.42 & 2.00 & 3.6\\
 06-11-98 &  R & 242 & 28 & 2.42 & 2.00 & 3.6\\
\noalign{\smallskip}
\hline
\end{tabular}
\end{table}