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. 2022 May 25;32(12):8597–8607. doi: 10.1007/s00330-022-08866-5

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Fig. 2 — Visualization of measurements of helical velocities. (a) The maximum forward velocity (maxV_for) in metres per second (m/s) describes the maximum helix velocity in downstream direction (blue arrow). (b) The maximum circumferential velocity (maxV_circ) in m/s describes the maximum cross-sectional helix velocity in circumferential direction within the axial measuring plane (blue arrow)