Fraction of blue galaxies as computed in different colours, based on the DS definition from Fig. 1 and colour–colour selection from Fig. 2. It is compared with observational data and with the original Butcher-Oemler curve in B − V, extrapolated to high z as fbl = (z/ 2) − 0.015 (mid panel, dot-long-dashed line). The lower limit for selecting samples is given in terms of redshift-variable absolute MB,MV and MK magnitudes (see text for details). The Poissonian error on fbl is given by σ2(fbl) = Nbl(N − Nbl) /N3 (see De Propris et al. 2004) and shown only for SIM cluster cores in the U − B plot as reference (upper panel).
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