Fig. 2From: Accuracy of surface strain measurements from transmission electron microscopy images of nanoparticlesThe black points indicate the ideal lattice for an fcc crystal in the [48] zone axis. The grey points are the positions of slightly displaced lattice points for a strained crystal. The strain at the central lattice point is calculated by finding the optimal affine transformation between the black and grey points, denoted by v and w, respectivelyBack to article page