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PSD, evaluated for bin widths of 0.33 μm, of type S microspheres as a function of pump speed for an LO counter. Uncertainty bars indicate one standard deviation of triplicate measurements. The PSD at diameters below the main peak, but above the lowest size bin, is ≈ 3000× smaller than the peak of the PSD and is insensitive to pump speed. The PSD at the lowest size bin shows anomalous behavior.
