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Mean values for the four tested features on each mouthpiece (bars), with indication of the three values of the repeated tests (dots). The standard deviations of the three measurements averaged along all mouthpieces are: 0.08 kPa for Oscillation threshold, 0.015 kPa for External sound, 68.9 Hz for Spectral centroid. Mouthpieces are ordered by descending feature values.
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