The ITA Settings

ITA Settings

ITA Settings of Space Groups

The option 'ITA Settings' gives access to the conventional settings and choices of the unit cells for all space groups. Accessible are also all various settings of monoclinic and orthorhombic space groups as listed in Table 1.5.4.4 of Volume A of International Tables for Crystallography (2016, referred to as ITA). In the case of monoclinic groups, the ITA settings refer to different choices of the unique axis (along the basis vectors a, b or c) combined with different choices for the oblique axes (described as cell choices 1, 2 or 3 in ITA). There could be up to 18 different settings for a monoclinic group. The ITA settings for the orthorhombic groups include up to six different settings corresponding to the six permutations of the basis vectors a, b or c.

Example C2/c (No. 15)

Example Pmn2₁ (No. 31)

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