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Displacement peak-to-peak amplitude plotted versus (a) fundamental frequency, and (b) sound pressure level. A correlation was found between displacement and frequency and is indicated by the fitted trend line with an of 0.774. No relationship was found between displacement and sound pressure level. The symbols denote: + Subject 1, Session 1; ○ Subject 1, Session 2; ∗ Subject 2, Session 1; △ Subject 2, Session 2; × Subject 3, Session 1; and □ Subject 3, Session 2.
