Main panel: g − r colour versus total r-band magnitude for the 2456 selected objects over 8 clusters. The red line marks the division line used in vdB15 to separate red-sequence galaxies from bluer galaxies for redshifts of z = 0.044 and z = 0.063, and should thus lie just below the red sequence. Inset panel: the colour−magnitude distribution of sources selected in the same way from the depth-matched CFHTLS fields (same parameter range).
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