\begin{table}%t1
\caption{Summary of the dynamical properties of the bodies injected into the~$\nu_{6}$, 3:1 and 5:2~powerful resonances studied by different authors. The median lifetimes ({\small Half-Life}) of bodies initially in each of those resonances and the median times required to cross the orbit of the Earth ({\small $T_{\rm cr}$} {\footnotesize Earth}) have been derived by Gladman et~al. (\cite{Gladman97}). 
Bottke et~al. (\cite{Bottke02}) determined the median times spent in the NEA~region ({\small $T_{\rm NEA}$}) for bodies coming from the different resonant regions. On the other hand, the typical end states were 
analyzed by Gladman et~al. (\cite{Gladman97}) who followed the orbital histories of more than one
hundred particles injected into each resonance for up to $\sim$100~Myr. Finally, the mean collision probabilities with Earth ({\small $P_{\rm col}$} {\footnotesize Earth}), integrated over the lifetime in the Earth-crossing 
region, were derived by Morbidelli \& Gladman (\cite{Morbidelli98}).}
\label{Tabla1}
%\centering
\small
\begin{tabular}{lccc}
\hline\hline
        &  ${{\nu}}_{{6}}$          &   {3:1}     &    {5:2} \\ 		 \hline
                 \multicolumn{4}{c}{Time scales (Myr)} \\
{\small Half-Life}                       &    2.3     &  $\sim$2.4     &  $\sim$0.6  \\    
{\small $T_{\rm cr}$} {\footnotesize Earth}   &    0.5     & $\sim$1.2      &  $\sim$0.4 \\  
{\small $T_{\rm NEA}$}                       &  6.54      &  2.16          &  0.4         \\  
\hline
      \multicolumn{4}{c}{End states ($\%$)} \\
{\small Impact sun}                      &  79.1      &  $\sim$71.5    & $\sim$7.1     \\  
{\small Hyperbolic orbit}                & 11.8       &  $\sim$27.4    &  $\sim$90.9   \\  
{\small Survivors}                       &  1.8       &     0.7         & 0              \\  
\hline
       \multicolumn{4}{c}{Collision probability}   \\
{\small $P_{\rm col}$} {\footnotesize Earth}   &  $\sim$10$^{-2}$    & 2 $\times$ 10$^{-3}$ &  2.5 $\times$ 10$^{-4}$ \\  
\hline
\end{tabular}
\end{table}