Galaxy counts in the field of PSZ1 G064.83+35.79 as a function of the redshift (solid line) and its corresponding +1.5σ error (dotted line). For this particular case, the richness, represented by the green point in the plot, is computed using the (r′−i′,r′) CMD, thus obtaining a σR = 6.5 from likely members within 1 Mpc of the cluster center.
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