\begin{table}%t1
\caption{WFCAM filter specifications at operating temperature.}\label{tab1}
%\centering
\small
\begin{tabular}{c c c c c}
\hline\hline
Filter & 50\% & 50\% & Average 		& Typical \\
       & cut-on	& cut-off			& transmission 	& sky/Tel \\
	 &	& 				& 			& background \\
	 & $\mu$m & $\mu$m &	& elec/s/pixel \\
\hline
$Z$	&	0.83	&	0.925	&	0.94	&	50 \\
$Y$	&	0.97	&	1.07	&	0.80	&	80 \\
$J$	&	1.17	&	1.33	&	0.82	&	300 \\
$H$	&	1.49	&	1.78	&	0.86	&	2300 \\
$K$	&	2.03	&	2.37	&	0.78	&	2500 \\
S1	&	2.111	&	2.132	&	0.79	&	100 \\
Br $\gamma$	&	2.155	&	2.177	&	0.85	&	180 \\
\hline
\end{tabular}
\end{table}