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Series of AFM images showing: (a) contact mode AFM height image of USV before the FV scan; (b) height image acquired during the FV scan, with a resolution of 32 × 32 data points; (c) contact mode AFM height image after the FV scan; (d) matching of the two profiles (dashed white lines) from panels a and c; (e) circular fits (solid red lines) to the two profiles: RI = 57 nm, RII = 61 nm.
