\begin{table}%t5
\caption{Statistical characteristics of the n4v3-subset and (\mbox{n6v3-subset}).}\label{t4}
%\centering
\par
\begin{tabular}{lccc}
     \hline
     \hline
 Parameter       &   Mean   & Standard  & Median \\
                 &   value  & deviation &        \\
     \hline
     $R_{\rm b}$          &  3.4 (3.3)    &  1.0 (0.9) &  3.1 (3.1)   \\
     $R_{\rm e}$          & 14.0 (15.2)   &  6.9 (6.8) & 12.5 (14.0)   \\
     $R_{\rm m}$          &  8.7 (9.3)    &  3.6 (3.5) &  8.0 (8.6)   \\
     $\Delta R$     &  10.6 (11.8)  &  6.7 (6.6) &  9.2 (10.7) \\
      $\phi$         &   73 (77)     &   73 (74)  &  53 (57)    \\
 $v_{\rm m}$ (km~s$^{-1}$) &  465 (461)    &  295 (241) &  400 (412)  \\
 $a$  (m~s$^{-2}$)    & $-1.2$ $(-0.6)$ & 20.6 (14.6) & $-0.2$ (0.0)  \\
     \hline
\end{tabular}
\end{table}