\begin{table}%t2
\caption{Main WFCAM specifications.}\label{tab2}
%\centering
\small
\begin{tabular}{l l l }
\hline\hline
Item		& Specification	& Units and notes	\\
\hline
Detectors	& 4 Rockwell Hawaii-2 & PACE HgCdTe devices operating from 0.8 to 2.5 $\mu$m \\
Focal plane non-coplanarity & 50 & Microns. Peak-to-valley \\
Signal digitization & 16 & Bits	\\
Number of parallel channels & 128 (32 per detector) & In parallel, with synchronized clocks  \\
Available read modes 	& correlated double sampling, & \\
				& fowler sampling,			& \\
				& up-the-slope sampling		& \\
Pixel scale & 0.40 $\pm$ 0.01 & Arcsec  \\
Single-shot field of view & 0.21 & Square degrees  \\
2$\times$2 tile field of view & 0.79 & Square degrees  \\
Image Quality(MTF) & $>$0.5 & At a spatial frequency of 1.2 cycles per arcsec  \\
Image Quality(encircled energy) & $>$80\% & Within a diameter of 1.2 arcsec  \\
Autoguider CCD & E2V 47--10 & Backthinned non-inverted mode  \\
& & 1056 $\times$ 1027 pixels  \\
Autoguider window sample rate & 20--100 & Hz   \\
\hline
\end{tabular}
\end{table}