Category: atom_site_displace_Fourier
Data type: char
Must appear in a looped list
May match a value of '_atom_site_displace_Fourier_param_id'
A code identifying each component of the displacive modulation of a given atom or rigid group when it is expressed in terms of Fourier series. In the case of a rigid group it applies only to the translational part of the distortion.