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Fig. 3. Frequencies and sound pressures of constant-frequency (CF) jamming sounds
in relation to the audiogram of big brown bats. (A) Full frequency range. (B)
Expanded frequency range used for jamming experiments. At frequencies of
18–32 kHz, the jamming stimuli have a constant sensation level of about
65 dB. Filled symbols indicate CF jamming stimuli; other symbols indicate
individual animals. [Replotted from Dalland
(Dalland, 1965) and Koay et al.
(Koay et al., 1997).]