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. 2014 Sep 17;9(9):e107740. doi: 10.1371/journal.pone.0107740

Figure 2. Long-term and intra-annual trends in tonality of Antarctic blue whale song.

Figure 2

Long-term trend and intra-annual pattern in tonal frequency of Antarctic blue whale calls. Reprinted with permission from. Gavrilov et al. (2012). Copyright 2012 Journal of the Acoustical Society of America, American Institute of Physics.