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Four individual piezo movement-versus-deflection curves obtained at different positions along the fibril (diameter 240 nm) (a) at the middle of the channel, (b) between the middle and edge of the channel, (c) at the edge of the channel, (d) on the glass surface. (Inset) Enlargement of the snap-in points in the same piezo movement-versus-deflection curves. The scale units are 10 nm and 5 nm for horizontal axis and vertical axis, respectively.
