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Schematic of a conical resonator with apex angle θ and a lattice of toneholes. There is a length of duct L before the first symmetric T-cell centered at r 1 (left panel). The missing length of the cone is x 1. The nth T-cell, centered at r n , is flanked by cones of length and on either side (right panel). The tonehole has cross-section s n = π and chimney height h n . The cross-section of the main bore under the tonehole is S n .
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