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Example of a center of pressure path in an individual COPD patient at 760 m (left) and at 3100 m (right). Measurement at 760 m and 3100 m: center of pressure path length (COPL), 21.6 and 39.8 cm; antero-posterior sway velocity, 0.476 and 0.995 cm/s; medio-lateral sway velocity, 0.437 and 0.67 cm/s.
