\begin{table}%t2
\caption{Some of the most important dynamical results derived by Bottke et~al. (\cite{Bottke02}) for bodies coming from the different NEA~source regions. The sources studied by these authors were the~$\nu_{6}$ and 3:1~resonances, the intermediate source Mars-crossing (IMC) population (namely, 
Mars-crossers below the~$\nu_{6}$), the Outer Main Belt (OB) and the Jupiter-family comets. 
{\small $N_{\rm NEA}$($H<$ 18)} 
represents the steady-state number of NEAs with an~$H$~magnitude smaller than~18, which is roughly
1~km in size. On the other hand, {\small $\tau$~(Myr$^{-1}$)} gives the number of bodies injected into the NEA~region 
per million~years while {\small $T_{\rm NEA}$}{\small (Myr)} is the mean dynamical lifetime spent in the NEA~region.}
\label{Tabla2}
%\centering
\small
\begin{tabular}{lcccccc}
\hline\hline 
            &  ${{{\nu}}_{6}}$      &   {IMC} & {3:1}  & {OB}    & {JFC}  & {Total} \\
\hline 
{\small $N_{\rm NEA}$($H<$ 18)}   &    360 $\pm$ 90 &  240 $\pm$ 40 & 220 $\pm$ 90 & 79 $\pm$ 12   & 61 $\pm$ 43  &  960 $\pm$ 120 \\ 
{\small $\tau$~(Myr$^{-1}$)}           &    55 $\pm$ 18  & 65 $\pm$ 15   & 100 $\pm$ 50 & 570 $\pm$ 120 &  --         &  790 $\pm$ 200 \\  
{\small $T_{\rm NEA}$}{\small (Myr)}      &  6.54         & 3.75        & 2.16       &  0.14          &  --      &  -- \\ 
\hline
\end{tabular}
\end{table}