Bilbao Crystallographic Server arrow Standard/Default settings

Standard/Default Space-Group Settings

The programs and databases of the Bilbao Crystallographic Server use the so-called standard or default settings. These are specific settings of space groups that coincide with the conventional space-group descriptions found in Volume A of International Tables for Crystallography (referred to as ITA). For space groups with more than one description in ITA, the following settings are chosen as standard: unique axis b setting, cell choice 1 for monoclinic groups, hexagonal axes setting for rhombohedral groups, and origin choice 2 (origin in -1) for the centrosymmetric groups listed with respect to two origins in ITA.

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