Macromolecular dictionary (mmCIF) version 2.0.09
The number as assigned in International Tables for Crystallography Vol. A, specifying the proper affine class (i.e. the orientation-preserving affine class) of space groups (crystallographic space-group type) to which the space group belongs. This number defines the space-group type but not the coordinate system in which it is expressed.
Mandatory item: noAlias:
_space_group_IT_number (cif_core.dic version 2.3)
The permitted range is [1, 230]
Related item: _symmetry.Int_Tables_number (alternate)