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. 2014 Dec 18;9(12):e115678. doi: 10.1371/journal.pone.0115678

Figure 2. Spectrograms of fin whale singlet and doublet song.

Figure 2

The IPI (s) is shown below the pulses for each sequence. Panel A shows a song sequence with a single IPI recorded off Southern California in October 2002 and Panel B shows a song sequence with doublet IPIs from Hawaii in December 2002. Note that the timing of singlet IPIs is more variable than doublet IPIs. Spectrogram characteristics: 1-s FFT, 80% overlap. Occassionally the short IPI of the doublet pair is repeated between doublet sequences, most commonly off Southern California (not shown).