\begin{table}%T3
\caption{\label{tab:filters}Characteristics of the filters.} 
\small%\centerline
{
\begin{tabular}{ccc}
\hline\hline\noalign{\smallskip}
  Name  &   $\overline{\lambda}$   &
   $\Delta\lambda$  \\ 
\hline 
{F439W} & 423 &   47 \\
{F555W} & 540 & 123 \\
{F675W} & 670 &   89 \\
{F814W} & 792 & 149 \\ 
\hline
\end{tabular}}
\smallskip
 $\overline{\lambda}$, the mean wavelength (nm). \\
  $\Delta\lambda$, equivalent width (nm).  \\
 Definitions are given in Biretta et~al. (1996).  
\end{table}