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(Color online) Representative muscle activation plots for fundamental frequency (F0) at phonation onset as a function of graded activation of CT versus LCA/IA at (a) TA level 1, (b) TA level 2, (c) TA level 3, and (d) TA level 4. Missing data points (blank areas) in subplot (a) represent activation conditions where phonation onset was not reached at the airflow levels used (300–1600 ml/s).
