Fig. 4
Hubble diagrams in the five SDSS bands for quasars (+), galaxies with zsp (∗ ) and with zph2 (× ) only. The squares are the faint galaxies undetected in the SDSS. The horizontal lines represent the declared magnitude limits of SDSS. In the central panel the two parallel lines are from Labiano et al. (2007) and the curve is the best-fit line for GPSs from Snellen et al. (2002).
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