This article has an erratum: [https://doi.org/10.1051/0004-6361/201016348e]
g − r vs. r − i colour–colour diagram. Red dots: galaxies with distances smaller than 1.8 Mpc from of the supercluster centre. The box outlines our photometric selection criteria for early-type galaxies (Eqs. (6) to (8)) in the supercluster. Blue dots: galaxies with 0.27 ≤ zphot ≤ 0.39 from the full CFHT field.
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