Fig. 1
From: Rapid deposition analysis of inhaled aerosols in human airways

Zones of deposition: extrathoracic (mouth and upper airways, gray), central (trachea and main bronchi, yellow), distal (visible small airways, indigo, purple, blue, pink, and green), peripheral (invisible airway, i.e., doses exiting outlets), intrathoracic (sum of central, distal, and peripheral depositions). Total lobe deposition: right upper lobe (RUL), right middle lobe (RML), right lower lobe (RLL), left upper lobe (LUL), left lower lobe (LLL).