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Fig. 2. (A) Click train of an echolocation event with a search, approach and buzz
phases. Arrow marks start of the approach phase, where the first echo is
received by the tag. (B) Expanded version of one of the clicks in A, showing
the emitted click and a returning prey echo. (C) Envelope of the
cross-correlation of the waveform displayed in B.
t marks the
delay between the sounds and thereby the two-way-travel time (TWT).