\begin{table}%t2
%\centering
\par
\caption{\label{table:Av}Filters and central, effective, wavelengths used in this work.}
\begin{tabular}{l l l l}
\hline\hline\\[-3.25mm]
Filter & $\lambda^{\rm {eff}}_{\rm c}$ & $\Delta\lambda^{\rm {eff}}$ & $A_{\lambda}$/$A_V$ \\
& $\mu$m & $\mu$m\\
\hline
$z^\prime$   &   0.88 & 0.27  &   0.52 \\
$J$    &  1.25 & 0.16  &  0.30 \\
CH$_4$off  &   1.58 & 0.10  &   0.21 \\
$H$    &  1.63 & 0.29  &  0.20 \\
CH$_4$on   &   1.69 & 0.10  &   0.18 \\
$K_{\rm s}$    &  2.15 & 0.32  &  0.13 \\
\hline
\end{tabular}
\end{table}