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Spectrogram of the mouthpiece pressure during the performance of pitch adjustments when fingering the tone C#5 (concert pitch E5) showing the theoretical fundamental frequency (659.26 Hz; marked as a horizontal dashed line) and the first harmonic. The interval of pitch variation (Ipitch) is considered between the lowest and the highest fundamental frequency achieved during the task. [Mouthpiece no. 6, first repetition].
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