Definition:
Matrix elements used to transform Cartesian coordinates in
the ATOM_SITE category to fractional coordinates. The axial
alignments of this transformation are described in
_atom_sites_Cartn_transform_axes. The 3 x 1 translation is
defined in _atom_sites_fract_tran_vector_.
x' |11 12 13| x | 1 |
( y' ) fractional = |21 22 23| ( y ) Cartesian + | 2 |
z' |31 32 33| z | 3 |
Type: numb
Category: atom_sites
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