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Schematic frontal section of the syrinx illustrating recruitment of layers into oscillation. The details in B–D are indicated in A (compare Fig. 1C,D). The two layers of the ML can be recruited variably into oscillation. (B) Relaxed position of the ML. (C) The ML is uniformly deformed. (D) The superficial layer is selectively involved in oscillation. P, pessulus; SL, superficial layer; DL, deep layer.
