\begin{table}%t3
%%\centering
\par
  \caption{Average systematic underestimate of
    the clustering length \ro\ and the slope \gam\ of the
    correlation function introduced by the mass incompleteness. The
    values are computed for each parameter as
    $\epsilon(x)~=~\langle\delta x~/~x\rangle_{40}$, where
    $\delta(x)~=~x_{\rm true}-x_{\rm observed}$ and the
    average is performed over 40 mock samples.  
  }
  \label{tab:roga_incompleteness}
  %%\centering
\par
  \begin{tabular}{ccc}
    \hline
    \hline
  $\log~(M/M_\odot)$    &   \multicolumn{2}{c}{Average underestimate}    \\
                      &   ~~~~~ $\epsilon(r_0)$   & $\epsilon(\gamma)$       \\
    \hline
  9.0--9.5  &    ~~~~~  25\%	      &          7\%             \\ 
  9.5--10.0  &    ~~~~~  11\%	      &          3\%             \\
 10.0--10.5  &    ~~~~~   3\%	      &          1\%             \\
 10.5--11.0  &    ~~~~~   0\%	      &          0\%             \\
    \hline
     $\ge$9.0    &    ~~~~~  13\%            &          5\%             \\
     $\ge$9.5    &    ~~~~~   6\%            &          3\%             \\
     $\ge$10.0    &    ~~~~~   2\%            &          1\%             \\
     $\ge$10.5    &    ~~~~~   0\%            &          0\%             \\
    \hline
  \end{tabular}
\end{table}