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In a real situation of course both forces lateral and normal to the surface are recorded simultaneously. 
The above picture shows a 2.5 x 2.5 nm simultaneous topographic and friction image of highly oriented pyrolytic graphic (HOPG). The bumps represent the topographic atomic corrugation, while the coloring reflects the lateral forces on the tip. The scan direction was right to left. (Naval Research Laboratory, Washington, DC)
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