The [1] element of the three-element vector used to transform
fractional coordinates in the ATOM_SITE category to Cartesian
coordinates in the same category. The axial alignments of this
transformation are described in _atom_sites.Cartn_transform_axes.
The rotation matrix is defined in
_atom_sites.Cartn_transf_matrix[][].
|x'| |11 12 13| |x| |1|
|y'|Cartesian = |21 22 23| |y|fractional + |2|
|z'| |31 32 33| |z| |3|