= Anisotropic displacement components in the IUCr core CIF dictionary
{c}
https://www.iucr.org/__data/iucr/cifdic_html/1/cif_core.dic/Iatom_site_aniso_U_.html
Core dictionary version2.4.5, `_atom_site_aniso_U_11`, `_12`, `_13`, `_22`, `_23` and `_33`, Definition: six entries of a real symmetric matrix in squared angstroms, with explicit structure-factor attenuation using reciprocal-cell lengths and Miller indices. These crystallographic components require the stated cell convention.
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