\begin{table}%t4
\caption{Values for $f_{{\rm ke}_{0}}$ and $\gamma$ for the different populations of our model.}
\label{Tabla4}
%\centering
\small
\begin{tabular}{lcc}
\hline\hline
{Populations}  & ${f_{{\rm ke}_{0}}}$   &  ${\gamma}$ \\
%&& \\[-8pt]
\hline
&  Main Belt-Main Belt   & \\
{\small IR-IR}     &  0.05   &  0.5  \\
{\small IR-MR}     &  0.1   &  0.2  \\
{\small IR-OR}     &  0.1   &  0.3  \\
{\small MR-MR}     &  0.3   &  0.5  \\
{\small MR-OR}     &  0.3   &  0.2    \\
{\small OR-OR}     &  0.35  &  0.5  \\ 
\hline
                   & Main Belt-NEA    & \\
{\small IR-NEA}   &  0.2   &  0.4  \\
{\small MR-NEA}   &  0.2   &  0.4  \\
{\small OR-NEA}   &  0.2   &  0.4  \\ 
\hline
                   & NEA-NEA  & \\
{\small NEA-NEA} &  0.2  &  0.4 \\          
\hline
\end{tabular} 		      
\end{table}