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Force-indentation curves and Hertz fit of the retraction part from force volume (FV) (a–c) and PeakForce Quantitative Nanomechanical Mapping (QNM) (d–f) recorded on fused silica (FS), highly oriented pyrolytic graphite (HOPG), and Au(111) (Au). Position of zero indentation was determined from the Hertz fit and does not necessarily indicate the contact point.
