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Figure 6


Fig. 6. Mean hearing thresholds (± s.e.m.) of all species with free swimbladders (blue) and paired, bony encapsulated bladders (red). Asterisks indicate statistically significant differences (Mann–Whitney U-test; for details see text). 1 kHz: *P<0.05, N=75; 2–5 kHz: **P<0.001, N=70–74.