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Particle number size distribution spectra of NFP 1 and 2, synth NFP 1:0.75, perfluorodisiloxane, and the two solvents (2-propanol and ethanol) used in NFP 1 and NFP 2. The spectra of NFP 1 and NFP 2 were measured using both the FMPS and the APS. All other spectra were only measured using the FMPS. All data are presented at an inlet flow of 0.05 ml/min. Vertical bars indicate SDs.