Delocalisation is an imaging artefact that results in the presence of lattice fringes outside a crystal imaged in a transmission electron microscope (TEM) in the presence of spherical aberration and/ or defocus. Here, we show that delocalisation can be used to determine the absolute defocus values of chosen features in a specimen from a defocus series of images, what may be used to improve computer reconstruction methods. These values are important for optimising the accuracy of information

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... t the specimen obtained using techniques such as exit wavefunction restoration.