Definition:
A code which indicates the refinement restraints or constraints applied to the atomic displacement parameters of this site.
Appears in list containing _atom_site_label
Related item: _atom_site_refinement_flags (alternate)
The data value must be one of the following:
|
. | no constraints on atomic displacement parameters |
|
T | special-position constraints on atomic displacement parameters |
|
U | Uiso or Uij restraint (rigid bond) |
|
TU | both constraints applied |
Type: char
Category: atom_site
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