**Table 1:** Optical instruments employed in our survey.
						Sloan i' filter		Sloan z' filter
Telescope	Observatory	Camera	Detectors	Pixel size	Area	$\lambda$ $_{\rm c}$	$\Delta \lambda$	$\lambda$ $_{\rm c}$	$\Delta \lambda$
				( $^{\prime\prime}$ /pix)	(arcmin²)	(nm)	(nm)	(nm)	(nm)
5-m Hale	Palomar	LFC^a	$6\times (1024 \times2048)$	0.360	450	768	154	900	180
3.5-m CAHA	Calar Alto	LAICA	$4\times (4096 \times4096)$	0.225	940	770	150	920	160

^a The original size of each CCD detector is $2048\times4096$ , and the pixel size is 0 $.\!\!^{\prime\prime}$ 18.
We applied a $2\times2$ binning to all LFC CCDs.

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