As described in figure captions, the photo were taken under two beam condition. They took the DF images with different g vectors, one was along the vertical direction of the film and the other was along film direction. Under two beam condition, there are only two strong reflections, transmission beam and other diffraction beam which has g vector. you can obtain the two beam condition by tilting sample. Then, you can take BF or DF by OA(objective aperture) selection.In this case, they took weak beam DF.
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