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Memory usage:
![Figure_1](https://private-user-images.githubusercontent.com/3132181/286519705-1e294cff-ab49-4984-88c0-503cf9830ebf.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.X8Uq2T3SUTOASNgi7WX5QqZosWCjm-bi7AQoqSXCLGo)
example file (saved as xlsx in LibreOffice).
TODO: