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Figure 2.

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Modulus and phase of the input impedance. Blue lines: direct computation from the TMM. Red dashed lines: modal decomposition with eight modes, obtained through equations (2) and (3). Three notes of the first register are represented: B♭3 (L = 667 mm), F4 (L = 396 mm) and C♯5 (L = 197 mm).

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