(a) Distribution of average |v_{He²⁺ − p}|/V_A (bin size = 0.02). The blue (pink) area indicates weak (strong) differential streaming. (b) Scale size distributions of SFRs with strong or weak differential streaming (logarithmic bins, ${\mathrm{\Delta }}_{{log}_{10}}^x$ = 0.06 au). (c) Normalized kernel density estimation functions for SFRs with different durations. (d) 2D histogram of the scale size and average V_A. Counts are normalized per x bin, with ${\mathrm{\Delta }}_{{log}_{10}}^x$ = 0.06 au and Δy = 3 km/s. (e) 2D histogram of |v_{He²⁺ − p}|/V_A and the related standard deviation. Counts are normalized per x bin, with Δx = 0.05 and Δy = 0.02. (f) Number of data points with strong differential streaming (N_s) related to the total number of measurements (N_meas) within each case. Error bars represent the 16th, 50th, and 84th percentile within each x bin. (g) Same as panel f but for data points with weak differential streaming (N_w).