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Baseline airway tone for all measured airways in each individual with asthma (A) and healthy controls (B). Each column represents one subject, and each circle or triangle represents one airway. The thick horizontal line represents mean airway tone for that subject. An airway in which albuterol did not change airway diameter is depicted with “zero” tone. *Baseline airway tone is defined as 100 − [(Airway diameter at TLC baseline)/(Airway diameter at TLC relaxed)] × 100.
