\begin{table}%t1
\caption{\label{tab1}Field statistics.}            
%\centering
\par
\begin{tabular}{l c c c}        
\hline\hline                
Field & GOODS-North & LH-North & LH \\    
\hline                       
Area (deg$^2$) & 0.031 & 0.371 & 5.17 \\      
Flux limit (mJy) & 10 & 20    & 48 \\
No. sources & 83 & 276 & 551 \\
Spectroscopic $z$ & 65 & 75 & 140 \\
Photometric $z$ & 18 & 161 & 322 \\ 
No $z$ (\%) & 0 & 14 & 16 \\
\hline                                  
\end{tabular}
\end{table}