\begin{table}%t2
%\centering
\par
\caption{FORS1 and ISAAC observations. Column 1: quasar name. Column~2: filter. Column~3: total exposure time in ks. Column~4: field of view  used for the analysis.\label{obs}  }
\begin{tabular}{cllll}
\hline\hline
Quasar & Band &  Seeing & Exp. time &Field \\
\hline
\ctq& $R$ &0.50\arcsec &1.45 &6.5\arcmin~$\times$~6.6\arcmin \\
       & $J$      &0.51\arcsec &2.00 &2.3\arcmin~$\times$~2.4\arcmin  \\
       & $K$s     &0.50\arcsec & 1.50&2.2\arcmin~$\times$~2.2\arcmin  \\
 \hline
\hezero & $R$& 0.74\arcsec & 3.40 & 6.4\arcmin~$\times$~6.6\arcmin  \\
            & $J$     & 0.58\arcsec & 2.60 & 2.5\arcmin~$\times$~2.4\arcmin  \\
           & $K$s  & 0.50\arcsec & 2.70  & 2.1\arcmin~$\times$~2.4\arcmin \\
\hline
\lbqs & $R$ &0.72\arcsec &3.90 & 6.5\arcmin~$\times$~6.6\arcmin \\
              &$J$      &0.44\arcsec &3.80& 2.4\arcmin~$\times$~2.5\arcmin \\
             &$K$       &0.53\arcsec & 4.50&2.2\arcmin~$\times$~2.2\arcmin\\
\hline
\bdix & $R$ &0.48\arcsec &6.00&6.6\arcmin~$\times$~6.6\arcmin \\
      & $J$ & 0.60\arcsec & 3.60 & 2.4\arcmin~$\times$~2.4\arcmin \\
      & $K$s & 0.60\arcsec &4.80 & 2.3\arcmin~$\times$~2.3\arcmin\\
\hline
\heonze& $R$ &  0.66\arcsec &0.80 &6.6\arcmin~$\times$~6.7\arcmin  \\
             & $J$     & 0.51\arcsec &3.50& 2.4\arcmin~$\times$~2.4\arcmin  \\
             & $K$s     & 0.34\arcsec & 4.80 & 2.2\arcmin~$\times$~2.3\arcmin \\
\hline
\btreize &$R$  &0.62\arcsec&4.80&6.6\arcmin~$\times$~6.7\arcmin  \\
 &$J$ &  0.64\arcsec & 3.60& 2.3\arcmin~$\times$~2.3\arcmin\\
 &$K$s&  0.47\arcsec & 4.50& 2.4\arcmin~$\times$~2.4\arcmin\\
\hline
\clover&$R$&0.58\arcsec & 1.70&6.2\arcmin~$\times$~6.2\arcmin\\
      &$J$  &0.59\arcsec& 2.60& 2.6\arcmin~$\times$~2.6\arcmin  \\
     &$K$s &0.49\arcsec&  3.60&  2.6\arcmin~$\times$~2.6\arcmin  \\
\hline
\hevingt&$R$&0.57\arcsec &1.70 &6.5\arcmin~$\times$~6.7\arcmin \\
            &$J$    &0.48\arcsec& 2.60& 2.3\arcmin~$\times$~2.5\arcmin \\
            &$K$    & 0.47\arcsec & 3.60&2.3\arcmin~$\times$~2.5\arcmin \\
\hline
\end{tabular}
\end{table}