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Fig. 2 —Bar graph shows lung density differences between inspiration and expiration among three area categories: lung with air trapping, abnormal lung without air trapping, and normal lung. Lung density differences were significantly smaller in areas with air trapping (mean ± SD, -19 ± 34 H) than in abnormal areas without air trapping (138 ± 36 H) (star, p < 0.001) and in normal areas (111 ± 49 H) (star, p < 0.001).