International
Tables for Crystallography Volume B Reciprocal space Edited by U. Shmueli © International Union of Crystallography 2006 
International Tables for Crystallography (2006). Vol. B, ch. 4.4, p. 461
Figure 4.4.4.6 ^{a}Division of Engineering and Applied Science and The Physics Department, Harvard University, Cambridge, MA 02138, USA 

Figure 4.4.4.6
Location of the Bragg peaks in one 60° section of reciprocal space for the threedimensional crystallineB phases observed in thick films of 7O.7. (a) The normal hexagonal crystallineB phase with ABAB stacking. (b) The onedimensional modulated phase with orthorhombic symmetry. The closed circles are the principal Bragg peaks and the open circles indicate side bands associated with the longwavelength modulation. (c) The twodimensional modulated phase with orthorhombic symmetry. Only the lowestorder side bands are shown. They are situated on the corners of squares surrounding the Bragg peak. The squares are oriented as shown and the amplitude of the square diagonal is equal to the distance between the two side bands illustrated in (b). (d) The twodimensional modulated phase with monoclinic symmetry. Note that the L position of one of the peaks has shifted relative to (c). (e) A twodimensional modulated phase with orthorhombic symmetry that is only observed on heating the quenched phase illustrated in (g). (f) The twodimensional modulated phase with hexagonal symmetry and AAA layer stacking. (g) A twodimensional hexagonal phase with AAA layer stacking that is only observed on rapid cooling from the phase shown in (c). 