\begin{table}%t1
\caption{Observation parameters and layout results.}\label{table:1}      
%\centering
\small              
\begin{tabular}{l c c c}
\hline \hline                
 & 20 antennas & 100 antennas & 230 antennas \\     
\hline                         
   Centre frequency&1.4 GHz &1.4 GHz & 1.4 GHz\\
   Declination&--30.715$^{\circ}$ &--30.715$^{\circ}$&--30.715$^{\circ}$\\
   Fractional bandwidth &0.2 & 0.2 & 0\\
   Number of channels & 16 & 14 & 1 \\
   Correlator dump time & 2 min & 4 min & 2 min \\
   Observation time & 8 h & 8 h & 8 h \\
   UV samples & 729600 & 8316000 & 6320400\\
   Grid size & 256 & 1024 & 1024\\
   Pixel size &10$''$ & 2.5$''$ & 2.5$''$\\
   \hline
   Minimum baseline & 30 m&30 m&30 m\\
   Maximum baseline & 884 m & 4475 m & 5352 m \\ 
   Maximum sidelobe & 1.9\% & 0.61\% & 0.49\% \\
\hline                                    
\end{tabular}
\end{table}