Colour–magnitude diagram for MACS J0717+3745. The black points are all the galaxies in the field. The green crosses are the galaxies in a radius of 1 Mpc around the cluster centre. The red crosses show all the galaxies with spectroscopic redshifts in the cluster range (taken to be [0.530, 0.560]). The red line is the best fit of the cluster red sequence. The cyan points show the galaxies with a colour within ±0.3 of the cluster red sequence, and selected as belonging to the cluster.
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