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\bibitem{Gao_etal2024} {\textquotedblleft}\textit{On central focusing for contrast optimization in direct electron ptychography of thick samples}{\textquotedblright}. Gao C, Hofer C, Pennycook TJ, Ultramicroscopy \textbf{256}, 113879 (2024).   http://doi.org/10.1016/J.ULTRAMIC.2023.113879

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