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

International Tables for Crystallography (2016). Vol. A, ch. 1.6, p. 109

Figure 1.6.2.1 

U. Shmuelia and H. D. Flackb
[Figure 1.6.2.1]
Figure 1.6.2.1

Ideal p.d.f.'s for the equal-atom case. The dashed line is the centric, and the solid line the acentric ideal p.d.f.