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Spatial and temporal trends in fin whale vocalizations recorded in the NE Pacific Ocean between 2003-2013

Fig 2

Spectrograms from the Axial instrument showing examples of the two primary song sequences observed.

(A) Sequence with one primary frequency and a single IPI (singlet song). (B) Sequence with alternating notes, with two frequencies and two dominant IPIs (doublet song). There is also an earthquake in this record.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0186127.g002