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Fig. 2. Thresholds for passive false killer whale-like clicks presented 2 m in
front of the whale (specified in sound-pressure level, SPL) and thresholds for
clicks produced by the whale (specified in source level). Note that (with
targets present) the whale is about 40 dB less sensitive to clicks that it
produces as compared with passively presented clicks. ABR, auditory brainstem
response.