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The interactions between two streamwise vortices were investigated by wind tunnel testing of two NACA0012 vanes at various lateral offsets. One vane was spaced 10 chord lengths (C) downstream of the other, with both at an angle of incidence of 8 degrees and a Reynolds number of 7×104. The evolution of the vortex pair was observed until 6.5C behind the downstream vane using Particle Image Velocimetry...