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Item _atom_site.U_equiv_geom_mean

Description

              Equivalent isotropic atomic displacement parameter, U~eq~,
               in angstroms squared, calculated as the geometric mean of
               the anisotropic atomic displacement parameters.

               U~eq~ = (U~i~ U~j~ U~k~)^1/3^

               U~n~ = the principal components of the orthogonalized U^ij^

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