Fractions of the various S0 spectral classes across the PPS infall regions defined in Fig. 1. Red bars represent S0–PS, blue bars S0–AC, and green bars S0–TR galaxies, with the numbers below the bars indicating their fractional abundances. The numbers following each label denote the average time since cluster infall for each S0 class, calculated by weighting their relative abundance in each infall region by the mean time since infall (see text). The 1σ error bars were derived from 1000 bootstrap resamples with replacement of the original distributions in each infall region.