Molecular (not crystallographic) symmetry. The author can specify a point group or a set of symmetry operations (this could be useful for a helical molecule or one in a non-standard orientation.)
The content is the symmetry operators as (4*3) matrices (X.ARR). These should have the form [R|t] where R premultiplies the coordinates and t is a column translation vector. It is up to the author whether they give a complete set of operators (e.g. 48 for Oh) or whether they give just the group generators. The identity matrix can be assumed to be present in all cases.
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