Scaled differential densities in panels a) and b). In red, a standard normal distribution with zero mean and σ = 1 is shown. Dashed black lines mark bin boundaries for two grid spacings: a) N_BpS = 0.5, b) N_BpS = 1. FRD results are presented in blue. Bin integrated mean values (steps) and the distribution determined from a moment calculation (line) are shown. Blue and red crosses mark the values at the bin centres. In panel c), the ratios T_out/T_in of the respective FRD over N_BpS are shown in blue. The results for T_y, out/T_y, in of the VPAS are included in orange. The α_in axis on the top of panel c) is scaled to approximately match the scale of N_BpS. The dashed lines mark the N_BpS values from panels a) and b), respectively. Coloured horizontal lines in panels a) and b) mark three effective thresholds, e.g. FRD_LS(10⁻¹) in brown. For these three thresholds and for the FRD panel d) shows the density ratio n_sw, out/n_sw, in, panel e) gives the velocity difference relative to the thermal speed (v_sw, out − v_sw, in)/v_th, in, and panel e) provides the temperature ratio T_out/T_in in the same scaling as panel c) (but with a lower upper limit).