a. Figure 4.11 The effect of non-symmetrial changes in the lattice parameter on the symmetry of the transmitted HOLZ pattern; a.) a, b, and c 3.5713 Angstroms, b.) a, b, and c 3.5713 Angstroms, and c.) a = 3.5713, b and c a. The mirror symmetry in the pattern has been lost. The mirror is perpendicular to this caption.