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Fig. 7.10: Time history of vertical velocity component. Original measurements at 20 kHz (solid black line), samples extracted at 833 Hz (dots), super-sampled from 833 Hz to 20 kHz (solid red), linear interpolation of samples at 833 Hz (dashed blue)
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Fig. 7.11: Amplitude spectrum of vertical velocity fluctuations. Comparison between reference data at 20 kHz (black), sub-sampled at 1.67 kHz (blue) and super-sampled by advection (red). Nyquist limit for the sub-sampled data indicated in dashed blue line
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