Coherent CBED pattern from FeS2 with the beam along  (d001 = 0.54 nm, 200 kV), showing interference between overlapping Bragg beams. The Bragg disc directly below the central disc is (020). Arrows indicate contrast reversals due to structure-factor phases. Reproduced with permission from Terauchi et al. (1994). Copyright (1994) Elsevier.