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Figure 6

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Artificial-mouth pressure pmouth, mouthpiece pressure pmouthpiece and external sound pressure pextern when recording a mouth-pressure ascending ramp at 1 kPa/s. On the right side, zoomed view of 300 ms around the tone onset. R indicates the threshold of oscillation, considered to assess resistance (vertical red line indicates the first instant where pmouthpiece > 0.5 kPa). B indicates the time interval of mouthpiece pressure used to compute the spectral centroid (Fig. 7), considered to assess brightness. L indicates the external sound amplitude considered to assess loudness, at pmouth between 12 and 12.5 kPa. [Mouthpiece no. 10, first repetition].

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