\begin{table}%t1[b!]
      \caption{Simulation of the effect of completeness. We have simulated two distributions of sources which obey the linear relationship given in Eq.~(\ref{eq2}).  We have then excluded a part of this sample and looked for a  relationship. The power law index is indicated in this table together with its error (errors are quoted at the 1$\sigma$ level).}
         \label{table_completude}
     $$ 
         \begin{tabular}{ccc}
            \hline\hline
            \noalign{\smallskip}
            Sample     &   Gaussian & Flat\\
	     excluded  &   distribution& distribution\\
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
        5\%  & 1.02 $\pm$ 0.03 & 1.02 $\pm$ 0.03\\
        10\% & 1.02 $\pm$ 0.05 & 1.02 $\pm$ 0.05\\
        25\% & 1.02 $\pm$ 0.06 & 1.03 $\pm$ 0.06\\
	50\% & 1.00 $\pm$ 0.08 & 1.01 $\pm$ 0.09\\
	75\% & 0.91 $\pm$ 0.12 & 0.92 $\pm$ 0.12\\
            \noalign{\smallskip}
            \hline
         \end{tabular}
     $$ 
   \end{table}