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. 2014 Jul 7;9(7):e101687. doi: 10.1371/journal.pone.0101687

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© 2014 Costa et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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In the images at 500 pN constant force (a,b,c,d) the scale bar is 30 a) Sample topography, b) force between the tip and the sample (error), c) force gradient and d) damping factor. In the images at 1 nN (e,f,g,h), the scale bar (a,e) is 30 e) Sample topography, f) force (error), g) force gradient and h) damping factor.

Inline graphic — In the images at 500 pN constant force (a,b,c,d) the scale bar is 30 a) Sample topography, b) force between the tip and the sample (error), c) force gradient and d) damping factor. In the images at 1 nN (e,f,g,h), the scale bar (a,e) is 30 e) Sample topography, f) force (error), g) force gradient and h) damping factor.