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Figure 8
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Cost corresponding to the reflection coefficient, with respect to the first hole radius Rh1 and chimney height Hh1, for frequencies in [0.1, 4] kHz with a 0.1 kHz step. (a) The fingering for which only the first hole is open (oxxx). (b) Five fingerings (xxxx, xxxo, xxox, xoxx, oxxx)
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