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Fig. 4. Spectral characteristics of the induced flow. (A-D) Axial inflow and (E-H) radial outflow spectral data for the sample case of Moth 7 (A,B,E,F) and Moth 12 (C,D,G,H). For each moth, the top panels show standard Fourier plots (Moth 7: A,E; Moth 12: C,G) and lower panels show the Welch's Overlapped Segment Averaging (WOSA) plots (Moth 7: B,F; Moth 12: D,H). A vertical bar in each of the WOSA plots shows the 95% confidence interval for the spectral estimate.