\begin{table}%t2
  %%%\centering
\par
  \caption{\label{zphot_tab}Photometric redshifts. Uncertainties take into
    account the scatter in the best fits with different choices for
    photometric measurements (aperture size, reference filter...).
    Note that HST data are not used for photometry.}
  \begin{tabular}{lcccc}
    \hline \hline\noalign{\smallskip}
    Arc &A01    &A02    &A2 &A4 \\
    \noalign{\smallskip} \hline 
   \noalign{\smallskip} \zp
    &$1.64\pm0.15$&$1.6\pm0.1$&$1.7\pm0.2$&$1.58\pm0.2$\\
    \noalign{\smallskip}\hline\noalign{\smallskip} 
    Arc &A1 &A5 &A'1    &A6 \\\noalign{\smallskip} \hline\noalign{\smallskip} 
    \zp &--&$1.60\pm0.1$&--&$1.1\pm0.3$\\
    \hline
  \end{tabular}  
\end{table}