Category: atom_site_displace_Fourier_param
Data type: char
Must appear in a looped list
Must match a value of '_atom_site_displace_Fourier_id'
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.