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Figure 4
Beamline spot size at the sample surface. The beamline energy was 400 eV and the exit slit set to 10 µm in vertical size, the Y axis in the figure is drain current from a sharp platinum foil edge, spot size was estimated from an evaluation of the displacement needed for the drain current intensity to change from 20% to 80%, horizontal and vertical beam sizes in the figure are 100 µm and 25 µm, respectively.

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