Table 1: Narrowband surveys for Ly$\alpha $ at z = 5.7.

Survey
Fields Total area Narrowband Filter Co-moving Narrowband detection
    (sq. degree) filters width (Å) volume (Mpc3) limit ($\mu $Jy)
LALA (Rhoads & Malhotra 2001) 1 0.19 2 75 $0.2\times10^6$ 0.41
CADIS (Maier et al. 2003) 4 0.11 8-9a 20 $0.04\times10^6$ 3.33
A03 (Ajiki et al. 2003) 1 0.26 1 120 $0.2\times10^6$ 0.14
SSA22 (Hu et al. 2004) 1 0.19 1 120 $0.2\times10^6$ 0.30
WFILAS (this paper) 3 0.74 3b 70 $1.0\times10^6$ 1.06-1.74
a CADIS is based on imaging with a tunable Fabry-Perot interferometer scanning at equally spaced wavelength
steps (Hippelein et al. 2003). b An additional encompassing mediumband filter was used here.

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