Copyright © American Speech-Language-Hearing Association From: Estimation of Alveolar Pressure During Speech Using Direct Measures of Tracheal Pressure J Speech Lang Hear Res. 1999;42(5):1136-1147. doi:10.1044/jslhr.4205.1136 Legend: The range of pressures and resistances used by subjects during inhalation, release of the initial voiceless plosive /p/ in “pop,” and during the vowel /u/ in “took,” The curved line is based on the equation Pt = Pa (Ruaw/(Ruaw+Rlaw)). Pt is expressed in terms of percent of Pa and Ruaw is expressed as a multiple of Rlaw. Date of download: 10/21/2017 Copyright © American Speech-Language-Hearing Association