Figure 4
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Costs evolution for different observables computed for frequencies in [0.1, 4] kHz with a 2 Hz step, for the fingering “oxxx” with respect to: (a) the location and, (b) the radius of the first hole. The observables are: the complex value (solid lines), the modulus (dotted lines) and the phase (dashed lines) of the impedance (gray) and the reflection coefficient (black).
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