Figure 1. Waveform and spectrogram of paired burst bouts from two whales.

(a) Waveform showing relative amplitude and timing and (b) Spectrogram showing frequency content and timing of paired bursts recorded on tag mn08_189a, ‘Falcon'. The first and last high amplitude bouts were defined as focal-associated, and the middle, lower amplitude bout was defined as non-focal. Spectrogram parameters, 64 kHz sample rate, 4096 Hann window, 50% overlap.