Data type: char
May appear in a looped list
Related item: '_space_group_symop_operation_xyz'
Related function: replace
Symmetry equivalent position in the 'xyz' representation. Except for the space group P1, this data will be repeated in a loop. The format of the data item is as per International Tables for Crystallography, Vol. A. (1987). All equivalent positions should be entered, including those for lattice centring and a centre of symmetry, if present.