\begin{table}%t4
\caption{Statistics of CMEs faster than solar wind at $R\ge25$.}\label{tx}
%\centering
\par
\begin{tabular}{lcccc}
     \hline
     \hline
 $v^*$ (km~s$^{-1})$  &   $N $    & \%  &  $\overline \phi$ &  $\overline a_{\rm m}$ \\
 \hline
    500   &   374(215)   &  8(57)  &      137       &    +0.9     \\
    600   &   299(177)   &  7(59)  &      143       &    +1.4     \\
    800   &   175(107)   &  4(61)  &      166       &    +3.1    \\
   1000   &    88(53)    &  2(59)  &      196       &    +5.2    \\
     \hline
\end{tabular}
\end{table}