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(Color online) The phonation threshold pressure Pth (a), onset frequency F0,th (b), and estimated prephonatory glottal opening area Ag,th (c) as a function of the medial surface thickness T. ○: Eb = 63.33 kPa; ◊: Eb = 21.56 kPa; □: Eb = 5.51 kPa. The cover layer stiffness Ec = 5.51 kPa for all cases shown.
