\begin{table}%t4
\caption{Quality of photometric redshifts determined with/without $K$-band photometry and
with/without prior down to different $K$~magnitude limits and for two intervals of $i^{\prime}$~magnitudes.}   
\label{zphot_zspec_comp}      
%\centering
\small
\begin{tabular}{l c c c c c c}       
\hline\hline     
 & $K\leq 20.25$ & $K\leq 20.5$ & $K\leq 21.5$ & $K\leq 20.25$ & $K\leq 20.5$ & $K\leq 21.5$ \\
 Nobj & 890 & 917 & 946 & 347 & 453 & 817\\
 \hline
 & \multicolumn{3}{c}{$17.5\leq i^{\prime} \leq 22.5$} & \multicolumn{3}{c}{$22.5 < i^{\prime} \leq 24.0$}\\
 \hline
 & \multicolumn{6}{c}{without $K$, without prior}\\
$\sigma_{\Delta z /(1+z)}$ & 0.0280 & 0.0280 & 0.0280 & 0.0384 & 0.0379& 0.0351 \\
 $\eta$ (\%) &   7.75  & 8.18 & 8.35 & 7.78 & 7.73 & 7.71 \\   
\hline
 & \multicolumn{6}{c}{with $K$, without prior} \\
 $\sigma_{\Delta z /(1+z)}$ &  0.0265 & 0.0265 & 0.0267 & 0.0349 & 0.0345& 0.0327 \\
 $\eta$ (\%) &   1.91 & 1.96 & 2.11 & 5.76 & 5.30 & 5.38\\
 \hline
 & \multicolumn{6}{c}{without $K$, with prior} \\ 
 $\sigma_{\Delta z /(1+z)}$ & 0.0270& 0.0268 & 0.0268 & 0.0381 & 0.0367 & 0.0339 \\
 $\eta$ (\%) &    2.58 & 2.62 & 2.85 & 6.05 & 5.52 & 5.88 \\
 \hline
 & \multicolumn{6}{c}{with $K$, with prior} \\ 
  $\sigma_{\Delta z /(1+z)}$ & 0.0264& 0.0264 & 0.0265 & 0.0350 & 0.0336 & 0.0322 \\
   $\eta$ (\%) &   1.69 & 1.75 & 1.90 & 4.32 & 3.97 & 4.65 \\ 
 \hline
\end{tabular}
\end{table}