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Fig. 6.

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Ejected particles at the beginning of the experiment, and then after five and ten hours of the measurement (from left to right). For each image, 5453 pictures taken at 4000 frames per second were used; all particles were tracked and the tracks were combined into one picture. Because of the low brightness of the escaping particles, we had to overexpose the sample surface; for clarity reasons, we therefore masked out the surface in the images.

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