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The approximate occurrence of residual particles containing 0, 1, or more than 1 drug particle (left y-axis) and residual MMAD (right y-axis) with respect to drug concentration for micronized suspended drug with a MMAD of 1.5 μm (GSD of 2.0) for a HFA-134a formulation containing 8% (w/w) ethanol and no other excipients
