Corrections and Clarifications
In the report "Direct determination of grain boundary atomic structure in SrTiO3" by M. M. McGibbon et al. (7 Oct., p. 102), on line 10 of the third column on page 103, the term "three-dimensional" should have been "3d." In reference 17 of the same report (p. 104), "IEEE" should have been "IEE."