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Looking inside SPs with HAADF-STEM tomography. (a) Visualization of the three-dimensional reconstruction of a single SP, acquired by rotating the sample over two orthogonal tilt series and reconstructed using a SIRT algorithm. Orthoslices through the xy (b), xz (c), and yz (d) directions of the tomogram reveal several localized NC vacancies and groups of missing NCs in the bulk of the SP. All vacancies are clearly defined on a lattice position.
