Core dictionary (coreCIF) version 2.4.5
The 2D Cartesian coordinates (x,y) of the position of this atom in a recognizable chemical diagram. The coordinate origin is at the lower left corner, the x axis is horizontal and the y axis is vertical. The coordinates must lie in the range 0.0 to 1.0. These coordinates can be obtained from projections of a suitable uncluttered view of the molecular structure.
Appears in list containing _chemical_conn_atom_type_symbol
The permitted range is 0.0 -> 1.0