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Spectrograms of similar non-signature whistle responses (called “M” whistles) to non-signature whistle playbacks by four different males (with two examples from each of two males, FB178 and FB196). Frequency (up to 30,000 Hz) is on the y axes, and time in seconds is on the x axes. Spectrogram settings included a 1024 point Hanning window with 50% overlap
