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Fig. 2. Schematic of wake vortex parameters described in the text. The distribution of wake vorticity {omega}(x) is indicated by grey patches in this cross-section view. Hypothetical flow streamlines inside the vortex are sketched below the vortex patches. The integrals in Eq. 4 are evaluated throughout the vortex volume VV and on the vortex surface SV. The dimension S is the wake vortex width.