Data type: numb
Must appear in a looped list containing '_chemical_conn_atom_type_symbol'
Enumeration range: 0.0 -> 1.0
The 2D Cartesian coordinates (x,y) of the position of this atom in a recognisable 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. If absent, values will be assigned by the journal or database staff.