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. Author manuscript; available in PMC: 2015 Aug 25.
Published in final edited form as: Hear Res. 2011 Feb 4;277(0):134–142. doi: 10.1016/j.heares.2011.01.018

Fig. 3.

Fig. 3

Scatter plot showing the fundamental frequency (F0) of 30 examples of the short purr from animals of different ages. The larger symbols have greater numbers of examples – in this case 3 and 7. The linear regression line has a negative slope and a correlation value of 0.75. The F0 of the calls decreases as the animals increase in age/size.