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Fig. 3 —Breathing graphs generated by vibration response imaging device (VRIxp, Deep Breeze) show data for 32-year-old healthy man (top graph) and 60-year-old healthy man (bottom graph): x-axis is time (12 seconds) and y-axis is breathing intensity bar. Subjects were instructed to target breathing to range of 1.5–3.5 on breathing intensity bar and to breathing cycle rate of 16–24 cycles per minute. Dot depicts time of shown frame. Arrow points to recordings of maximum breathing intensity.