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

Fig 3

Call template used for detection with a matched filter and examples of two synthetic notes aligned with the filter.

The template lasts 2.3 seconds and matches the full range of frequencies seen in all notes. Notes with different frequencies will align differently with the template so after detecting a note with the matched filter, its time is set to that of the maximum amplitude of the note.

Fig 3