 Atomic displacement parameters in the IUCr core CIF dictionary (source code)

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= Atomic displacement parameters in the IUCr core CIF dictionary
{c}

https://www.iucr.org/__data/iucr/cifdic_html/1/cif_core.dic/Iatom_site_U_iso_or_equiv.html

Primary coreCIF2.4.5 definitions for `_atom_site_U_iso_or_equiv` and https://www.iucr.org/__data/iucr/cifdic_html/1/cif_core.dic/Iatom_site_B_iso_or_equiv.html . Units are angstroms squared; B and U components satisfy B=8pi²U. Dictionary recommends U in preference to B.

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