Figure 3

Spectrograms of the different AMW unit types detected and classified from the HAFOS (2013) and PALAOA data (2015–2017). Spectrogram settings HAFOS data: fast Fourier transform (FFT) length of 1125 samples, 95% overlap and Hanning window.

Spectrograms of the different AMW unit types detected and classified from the HAFOS (2013) and PALAOA data (2015–2017). Spectrogram settings HAFOS data: fast Fourier transform (FFT) length of 1125 samples, 95% overlap and Hanning window.