Phase-space diagram showing cluster SFgals (blue), nonSFgals (cyan), and OHgals (magenta) objects with 10 ≤ log(M/M_⊙)≤11. The histograms on the right for the different subsamples as a function of clustercentric radius are used to compute the observed fraction of star-forming galaxies and constrain quenching timescales by comparing with the Millennium simulation (cf. Fig. 7). The star-forming galaxies at R <  R₂₀₀ (magenta and blue symbols) have in general higher line-of-sight velocities than non-star-forming galaxies; this is indicative that these galaxies are an infalling population.