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. 2021 Feb 2;8:43. doi: 10.1038/s41597-021-00812-2

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© The Author(s) 2021

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Fig. 3 — Statistical analysis of the molecular composition of the QM7-X dataset. Schematic illustrations representing the number of structures containing at least (a) two or (b) three different heavy (non-hydrogen) elements. Note that all molecules in QM7-X contain C and H atoms. Triple combinations including C atoms are not shown in (b) since that information can be extracted from (a).