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Average f0 (across vowels) of studies listed in Appendix 1 as a function of age. The 3 groups, children (green), females (red) and males (blue) are the same studies as in the average plots of Figures 2 to 7; additional f0 data (magenta) are from studies with younger infants and children and include CS (Colton & Steinschneider, 1980), GRS (Gardosik, Ross & Singh, 1980) and KMe (Kuhl & Meltzoff 1996).
