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DEFFI and DESI setups and DEFFI parameters. (A) DEFFI and DESI sprayer setups (not to scale) and corresponding desorption footprints. The impact site of DESI spray is often elliptical due to asymmetry of the sprayer, while the DEFFI spray is rotationally symmetric and distorted only by the angle of incidence of the sprayer with the surface. (B) Illustration of the DEFFI configuration is shown with the corresponding parameters.
