 Fractional coordinates in the IUCr core CIF dictionary (source code)

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= Fractional coordinates in the IUCr core CIF dictionary
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https://www.iucr.org/__data/iucr/cifdic_html/1/cif_core.dic/Iatom_site_fract_.html

Core dictionary version2.4.5, `_atom_site_fract_x`, `_atom_site_fract_y` and `_atom_site_fract_z`, Definition: atom-site coordinates expressed as fractions of the cell lengths. The linked Cartesian coordinate items provide an alternate representation.

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