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(Color online) Typical sinusoidal waveforms of the displacement (x) and shear force (F) signals detected by the rheometer for the following: (a) no specimen, for the estimation of system noise level (frequency=25 Hz); (b) the ANSI S2.21 standard polymer material (frequency=150 Hz); and (c) a vocal fold cover specimen from the 79-year-old male (frequency=100 Hz). The displacement amplitude was 0.01 mm in all cases (dotted line=displacement; solid line=force).
