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. Author manuscript; available in PMC: 2013 Jul 19.
Published in final edited form as: Am J Primatol. 2010 Nov;72(11):974–980. doi: 10.1002/ajp.20854

Figure 2.

Figure 2

Slopes for phee calls. Slope 1, shown to the left, plots the rising slope (Hz/s) in phee calls that occurs from the pulse onset to the peak frequency. Slope 2, shown to the right, plots the descending slope (Hz/s) from the peak frequency to the pulse onset. Pulse 1 is shown in the black line, while pulse 2 is shown by the grey line.