Fin whale acoustic populations present in New Zealand waters: Description of song types, occurrence and seasonality using passive acoustic monitoring
Fig 2
Colors: spectrogram of one.wav file (here: from the Cook Strait dataset) showing fin whale ‘doublet’ calls. Black and white: binarized spectrogram. Frequency resolution = 1 Hz, time resolution = 0.5 s, binarization thresholds = determined with trials (Cook Strait dataset: 88 dB, Gisborne dataset: -100 relative dB; S1 Appendix).