Fig. 2
SDSS DR7 photometric redshift zp (Artificial Neural Network estimates, Oyaizu et al. 2008) versus spectroscopic redshift z for the IR-emitting galaxies with available z and zp in the supercluster field (471 galaxies in the displayed z and zp ranges). The solid pink line is the identity relation z = zp. The dash-dotted red lines indicate the chosen zp range for membership selection (see text and Fig. 3).
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