\begin{table}%t4
%\centering
\par
\caption{Characteristics of the galaxy number overdensities. Column~1: quasar name. Column~2: limit for the galaxy catalog  (said to be  as complete as the  FDF galaxy catalog   where the curves in Fig.~\ref{num}-top join). Column~3: magnitude range over which  we can study the significance of the galaxy overdensity. Column 4: position of the center of the galaxy number overdensity relative to quasar image A (see Figs.~\ref{iso1} and~\ref{iso2}). The uncertainty of the exact position of the galaxy overdensity is about~5\arcsec. Column 5: galaxy density at the location of the  galaxy overdensity center. Column~6: FDF mean galaxy density in the magnitude range given in Col.~3. Column~7: FDF maximal galaxy density in the same magnitude range. Column~8:  detection level 
(in~$\sigma$) of the cluster compared to the FDF mean galaxy density level. Column~9: detection level of the cluster (in the magnitude range given in parentheses) above  the galaxy background level measured in the same frame.    \label{density} }
\begin{tabular}{ccccrrrrr}
\hline\hline
 & Compl.       &Mag        &Galaxy overdensity       & Density          & FDF       & FDF        &  Above  & Above\\
 & limit       &range       &   location    &             & mean      & max        & FDF  &    background \\
&             &            &   $\Delta\alpha$, $\Delta\delta$   &  gal/(\arcmin)$^2$ &   density  & density           & density        &   mean                \\
\hline
\ctq & 25.2& $24\leq R <25$&     $-$10\arcsec, $-$05\arcsec     & 29.0 & 14.4 & 25.0 &2.6$\sigma$& 4$\sigma$ ($24\leq R <25$)\\
\hezero &  24.5& $24\leq R <24.5$ & $+$40\arcsec, $-$05\arcsec& 7.7  & 5.4& 14.8  & 1.1$\sigma$& 2.5$\sigma$ ($24\leq R <25$)\\
\lbqs & 24.0 &$23\leq R <24$ & $+$60\arcsec, $+$40\arcsec&10.8  & 5.2& 10.0 & 2.8$\sigma$& 3.5$\sigma$ ($23\leq R <25$) \\
\bdix & 24.0 & $21\leq R <23$ &$-$90\arcsec, $-$70\arcsec& 11.0& 3.2 & 7.0 & 5.6$\sigma$&4.5$\sigma$ ($21\leq R <23$) \\
\heonze& 23.3 & $23\leq R <23.3$&$~~$00\arcsec, $+$50\arcsec& 9.0 &1.2 &2.0  & 26$\sigma$ & 4$\sigma$ ($23\leq R <24$)  \\
\btreize & 24.3& $22\leq R <23$ &$-$08\arcsec, $+$03\arcsec&4.6 & 2.2 & 6.0  & 3.0$\sigma$ & 5$\sigma$ ($22\leq R <23$) \\
\clover& 25.0 &$23\leq R< 25$&$-$10\arcsec, $-$10\arcsec& 38.3 & 19.7 & 32.5 &  2.3$\sigma$ &5$\sigma$ ($23\leq R <25$)\\
\hevingt & 24.0 & $23\leq R<24$&$+$08\arcsec, $+$07\arcsec& 10.6& 5.2 &10.0&  2.6$\sigma$ & 6$\sigma$ ($23\leq R <25$) \\
\hline 
\end{tabular}
\end{table}