Left panel: g − r (bottom panel) and g − i (top panel) average colours of ETGs inside the virial radius of the Fornax cluster as a function of the projected distance from the cluster centre. Right panel: g − i average colours derived in the inner parts for R ≤ 0.5 Re (lower panel), and in the galaxy outskirts at R ≥ 3 Re (top panel). The dashed line in each panel indicates the transition radius from the high-density to low-density regions of the cluster, at R = 0.8 ° =0.27 Mpc (∼0.4Rvir).
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