Figure 2.
Percentage of the time each frequency resulted in the highest airflow (red bars) and volume (blue bars) with the square waveform. The operational range with the square waveform is 5 to 25 Hz.

Percentage of the time each frequency resulted in the highest airflow (red bars) and volume (blue bars) with the square waveform. The operational range with the square waveform is 5 to 25 Hz.

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