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 Results for DC.creator="B." AND DC.creator="Souvignier" in section 1.4.4 of volume A
Eigensymmetry groups and non-characteristic orbits
Souvignier, B.  International Tables for Crystallography (2016). Vol. A, Section 1.4.4.4, pp. 66-67 [ doi:10.1107/97809553602060000922 ]
... orthorhombic family, but the unit cell has equal parameters a = b, then the eigensymmetry group of an orbit can belong to ...

Wyckoff sets
Souvignier, B.  International Tables for Crystallography (2016). Vol. A, Section 1.4.4.3, pp. 64-66 [ doi:10.1107/97809553602060000922 ]
... axes. Moreover, the symmetry operation which interchanges the a and b axes and shifts the origin by along the c axis ... rotations around axes parallel to the a and to the b axes. The translation maps to , and hence and have site ... conventional unit cell is spanned by three basis vectors a, b, c with lengths a, b, c and right angles ...

Wyckoff positions
Souvignier, B.  International Tables for Crystallography (2016). Vol. A, Section 1.4.4.2, pp. 62-64 [ doi:10.1107/97809553602060000922 ]
... 100) generated by the fourfold rotation , the glide reflection (of b type) and the translations , , . The general-position coordinate triplets ...

Crystallographic orbits
Souvignier, B.  International Tables for Crystallography (2016). Vol. A, Section 1.4.4.1, pp. 61-62 [ doi:10.1107/97809553602060000922 ]
Crystallographic orbits 1.4.4.1. Crystallographic orbits Since the operations of a space group provide symmetries of a crystal pattern, two points X and Y that are mapped onto each other by a space-group operation are regarded as being geometrically equivalent. Starting from a point , infinitely many points Y equivalent to X ...

General and special Wyckoff positions
Souvignier, B.  International Tables for Crystallography (2016). Vol. A, Section 1.4.4, pp. 61-67 [ doi:10.1107/97809553602060000922 ]
... 100) generated by the fourfold rotation , the glide reflection (of b type) and the translations , , . The general-position coordinate triplets ... axes. Moreover, the symmetry operation which interchanges the a and b axes and shifts the origin by along the c axis ... rotations around axes parallel to the a and to the b axes. The translation maps to , and hence and have ...

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