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carried out the STEM images, the alignment, and the reconstruction of the data; taken part in discussions and in the interpretation of the result; and written the manuscript. MH has designed the study, participated in the acquisition of the STEM images, performed data analysis; she has supervised the research and revised the manuscript and has taken part in discussions and in the interpretation of the results. DAA has grown the samples and has taken part in discussions and in the interpretation of the results. SIM has conceived the study, participated in its design, supervised the writing of the manuscript and the experimental part. All the authors have read and approved the final manuscript.”
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