Definition:
The code that identifies an atom in a loop in which the special function that describes its displacive modulation is being defined. This code must match the _atom_site_label of the associated coordinate list and conform to the rules described in _atom_site_label.
Appears in list as essential element of loop structure
Must match data name_atom_site_label
Type: char
Category: atom_site_displace_special_func
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