Distribution of the average axial velocity in peeled flux ropes (panels (a)–(c)) and the axial velocity in flux rope layers (panels (d)–(f)). The red horizontal lines indicate the corresponding layer of the azimuthal magnetic flux, i.e., 0%–20%, 20%–40%, 40%–60%, 60%–80%, and 80%–100%. The results of the randomized noise test are shown in panels (b) and (e), and the test results for orientation of the MC axis are shown in panels (c) and (f).