International
Tables for
Crystallography
Volume A
Space-group symmetry
Edited by M. I. Aroyo

International Tables for Crystallography (2015). Vol. A, ch. 1.4, p. 73

Figure 1.4.5.6 

B. Souvignierd
[Figure 1.4.5.6]
Figure 1.4.5.6

Orthogonal projection along [001] of the symmetry-element diagram for [P\bar{4}b2] (117) (left) and the diagram for plane group p4gm (12) (right).