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Figure 5

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Measured fundamental frequency of self-oscillations as a function of the applied fingering, for different values of the feedback gain Γ0, and for Lcav = 3 cm. The acoustic pressure sensed by the feedback microphone, u(t)/Sμ, and that emitted 20 cm away from the open end of the duct, prad(t), are also plotted for the case of all side holes being kept closed.

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