Atom-site occupancy in the IUCr core CIF dictionary (source code)

= Atom-site occupancy in the IUCr core CIF dictionary
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https://www.iucr.org/__data/iucr/cifdic_html/1/cif_core.dic/Iatom_site_occupancy.html

Core CIF dictionary item `_atom_site_occupancy`, Definition: fraction of the atom type present at a site; summed occupancies of types sharing a site should not significantly exceed1 unless a dummy site is modeled.