Mass functions of infalling groups for the Low-z (blue) and Evolution (red) samples and for the two combined (black), including only redMaPPer groups with spectroscopic redshifts and |v_pec|< 3σ_main. Differential counts are normalised to the number of CHANCES clusters in each sample and are not corrected for incompleteness. The error bars are Poisson uncertainties, and the arrows are 1σ upper limits. We show the full sample as a histogram and omit the error bars to avoid cluttering. The blue and red data points are slightly shifted horizontally for clarity.