_space_group
Contains all the data items that refer to the space group as a whole. Please see the IUCr page for further details.
_space_group.name_H-M_alt
The international Hermann-Mauguin space-group symbol as defined in International Tables for Crystallography Volume A. It allows any Hermann-Mauguin symbol to be given.
_space_group.IT_coordinate_system_code
A qualifier taken from the enumeration list identifying which setting in International Tables for Crystallography Volume A (2002) (IT) is used.