Ensemble-averaged in-plane velocity vectors (nearly U_z, U_θ) superimposed on contours of the radial velocity component (r* = 0.96). Vectors are diluted by 4:1 in both directions for clarity. The values of s/c indicate the intersection of the θ₂ plane with the blade chord: (a) s/c = 0, (b) s/c = 0.22, (c) s/c = 0.33, (d) s/c = 0.55, (e) s/c = 0.66, and (f) s/c = 0.98.