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In vitro measurements of DF compared with CFD results at a steady-state inspiratory flow of 5 L/min for the device and inlet particle (MMAD) size combinations of (a) CM and 880 nm, (b) CM and 1.78 μm, (c) CM and 4.9 μm, (d) SL and 880 nm, and (e) SL and 1.78 μm. Error bars on the in vitro results represent±1 SD.
