\begin{table}%t1
\caption{Narrowband surveys for \lya\ at $z = 5.7$.}\label{tab:otherSurveys}
%\centerline
{\begin{tabular}{p{5.0cm}cccccc} 
\hline\hline\noalign{\smallskip}
Survey                 & Fields & Total area   & Narrowband & Filter       & Co-moving      & Narrowband detection \\
                       &        & (sq.~degree) & filters    & width (\AA)  & volume (Mpc$^{3}$) & limit (\uJy)  \\
\hline
LALA \citep{Rhoads01}  & 1      & 0.19         & 2          & 75           & $0.2\times10^6$     & 0.41  \\
CADIS \citep{Maier03}  & 4      & 0.11         & 8$-$9$^{a}$          & 20           & $0.04\times10^6$    & 3.33  \\
A03 \citep{Ajiki03}    & 1      & 0.26         & 1         & 120          & $0.2\times10^6$     & 0.14  \\
SSA22 \citep{Hu04}     & 1      & 0.19         & 1          & 120          & $0.2\times10^6$     & 0.30  \\
%\\
WFILAS (this paper)    & 3      & 0.74         & 3$^{b}$ & 70           & $1.0\times10^6$     & 1.06--1.74 \\
\hline
\end{tabular}
}\medskip
\par
$^a$ {CADIS is based on imaging with a tunable Fabry-Perot
  interferometer scanning at equally spaced wavelength steps
  \citep{Hippelein03}.}
$^b$ {An additional encompassing mediumband filter was used
  here.}
\end{table}