International
Tables for Crystallography Volume B Reciprocal space Edited by U. Shmueli © International Union of Crystallography 2010 
International Tables for Crystallography (2010). Vol. B, ch. 4.6, p. 602
Figure 4.6.3.3 ^{a}Laboratory of Crystallography, Department of Materials, ETH Hönggerberg, HCI G 511, WolfgangPauliStrasse 10, CH8093 Zurich, Switzerland 

Figure 4.6.3.3
Schematic diffraction patterns for 3D IMSs with (a) 1D harmonic and (b) rectangular density modulation. The modulation direction is parallel to . In (a) only firstorder satellites exist; in (b), all oddorder satellites can be present. In (c), the diffraction pattern of a harmonic displacive modulation along with amplitudes parallel to is depicted. Several reflections are indexed. The areas of the circles are proportional to the reflection intensities. 