Ratio of luminous-to-faint galaxy numbers in the RS sample, defined from bi-colour separation and by fixed mass thresholds (except the SAM green lines, plotted for reference as to magnitude selection). Error bars are only shown for cluster cores in SIM. The dot-long-dashed curve shows the best fit for z ≤ 1 clusters by Gilbank & Balogh (2008), using fixed thresholds in magnitude equivalent to MV = − 20 and − 18.2.
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