\begin{table}%T2
 \caption{\label{tbl:sum}Main characteristics of the four events.}
\small
 %\centering
\par
\begin{tabular}{c c c c c c}
   \hline
   \hline
CMEs &  Speed at  &Final speed  & Acceleration
 & Flare & On-disk  \\
 & $\sim$2~$R_{\odot}$ (km s$^{-1}$) &(km s$^{-1}$) &range ($R_{\odot}$) &
strength &  activity   \\
\hline 
CME1 & 318&390 & 2.0 & C 3.8 & filament eruption  \\
& & & & &and flare\\
CME2 & 567&724 & 8.0 & C 2.2 & filament eruption  \\
& & & & &and flare\\
CME3 & 43&400 & 30.0 & -- & none  \\
CME4 &668& 1827 & 5.0 & X 1.2 & flare  \\
\hline
\end{tabular}
\end{table}