Distributions of small-scale flux rope properties for Category I. (a) Duration with 30 minutes as bin size. (b) Scale size with 0.0025 au as bin size. (c) The waiting time with two exponential fitting curves as denoted by the solid curves, 10 minutes as bin size. (d) The wall-to-wall time distributions with power-law fitting curves for the portion of each group as denoted; the same bin size as (c). The format is the same as Figure 3.