Figure 1 in Using calls as an indicator for Antarctic blue whale occurrence and distribution across the southwest Pacific and southeast Indian Oceans

Figure 1. Examples of the Antarctic blue whale calls detected from: (a) Dampier on 22 May 2013, (b) Perth Canyon on 9 August 2010, (c) Bass Strait on 7 August 2010, (d) Samoa on 16 January 2011, (e) Tonga on 23 July 2009, and (f) Tasman Sea on 28 April 2011. Spectrogram parameters show 512 samples per frame, 0.625 hop size in Hann window.