Definition:
A code identifying the (in general complex) coefficient of each term present in the Fourier series describing the displacive modulation of a given atom or rigid group. In the case of a rigid group, it applies only to the translational part of the distortion. This code must match _atom_site_displace_Fourier_id.
Appears in list as essential element of loop structure
Must match data name_atom_site_displace_Fourier_id
Type: char
Category: atom_site_displace_Fourier_param
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