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AFM topography images of the HOPG surface after the activation of the electrochemical process in H3PO4 described in the text. a) Characteristic topography image acquired over the A-region (see text for details), after positioning the AFM tip with the help of a CCD camera. The dotted line highlights the area covered by a rough film. At the bottom of the image, part of a blister is visible; b) characteristic topography image acquired over the C-region (see text for details).
