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Velocity vectors at end expiration and early inspiration in the bifurcation plane at the G3-4 bifurcation. Red (blue), positive (negative) axial velocity in the parent branch to the right (left). (a,b), NORM; (c,d), HFNR; (e,f), HFOV. Instantaneous Reynolds numbers at the parent branch (G3) are 52 for (a-d) and 147 for (e,f).
