Fraction of star-forming cluster members in Abell 209 detected in the radio (black diamonds) as a function of projected radial distance from the cluster centre, in units of R₂₀₀ (bottom) and in angular units (top). We only plot MGCLS sources with SFRs greater than the 5σ detection limit of SFR_5σ = 2 M_⊙ yr⁻¹ (see Appendix B for details). Grey circles show the fraction of star-forming galaxies using infrared-derived data from Haines et al. (2015) for 30 clusters. Error bars show 1σ uncertainties. A similar trend is seen out to 2 R₂₀₀ for both the radio- and infrared-derived fractions.