Fig. 3From: The advantages and challenges of non-invasive towed PILOT tags for free-ranging deep-diving megafaunaSurging acceleration and spectrogram and depth from; A a 25-min ascent phase from a 250-cm sicklefin devil ray, B details of the section delimited by the black rectangle in A. Warmer colours in the spectrogram represent stronger signals, whereas cooler colours represent weaker signalsBack to article page