Erratum to “Carbon nanotubes: A promising standard for quantitative evaluation of AFM tip apex geometry”

In the previously published paper [Ultramicroscopy 107 (2007) 293–298], in order to provide an overview of the AFM tip shape effect, we derived an equation for “Garcia model” in comparison with the equation of “Zenhausern model” that we employed in the study. It has been noticed recently that there is a sign mistake in the derivation of the “Garcia model” equation. Though the error does not affect our results, it is important to correct it. Two other minor errors in figure captions are also corrected.