CalAtom: A software for quantitatively analysing atomic columns in a transmission electron microscope image.

We developed a software tool named CalAtom in MATLAB™ for quantitative analyses of atomic columns in (scanning) transmission electron microscopy, (S)TEM, images. This software provides three algorithms to determine the position of an atomic column with high precision: the moment method, the model-based method and the multiple-ellipse fitting method. Based on the measured positions, the software offers several options for further analyses, such as in-plane scale local environments of the atomic columns, local elementary composition and real-space averaging of image motifs. As an example, we use the CalAtom software to determine atomic positions and local elemental composition of the MoS2(1 - x) Se2x alloy monolayers.