Star-forming galaxy fraction versus cluster-centric distance. Blue stars represent the star-forming galaxy fraction in 0.5r₂₀₀ radial bins. The error bars indicate the uncertainties in the fraction derived from binomial statistics. The star-forming fraction shows a steady increase with cluster-centric distance. However, this fraction remains lower than that in the coeval field (grey dashed line), indicating that environmental processes are quenching galaxies before they join the cluster dynamics or in-fall region.