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Box-and-whisker plot of luminal airway diameter (mm) at functional residual capacity (FRC) by lung segment at the first visit in the 6 airway segments that were measured across all subjects at both time points. Airway segments included the bronchus intermedius segment (BronInt), left lower bronchus number 6 segment (LLB6), left middle lobe segment (LMB), left upper lobe segment (LUL), right middle lobe segment (RMB), and right upper lobe segment (RUL).
