Monoclinic point lattice, diffraction pattern

FIGURE 5.9 In (a) an assembly of six scattering points has been convoluted with an orthorhombic point lattice, and in (c) the same arrangement with a monoclinic lattice. The corresponding diffraction patterns are, respectively, orthorhombic and monoclinic as well. The diffraction patterns, however, are very different in their intensities because the point lattices sample the continuous transform of the six scattering points, the asymmetric unit of these two-dimensional crystals, at different places. 

---