Galaxy radial velocity profiles, infalling shells, and turnaround radii. The solid blue curves show the average galaxy radial velocity profiles for redshifts z = 0.01, z = 0.62, and z = 1.04 (left, middle, and right panels, respectively). The dashed blue curves show the Savitzky-Golay smoothed profiles based on a ten-bin window (Savitzky & Golay 1964). The shadowed region shows the error in the smoothed profile. The vertical black line shows the average turnaround radius based on the velocity profiles. In each panel the blue vertical band indicates the infalling shell with boundaries at cluster-centric radii where the velocity is 0.72v_min (Sect. 4).