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Figure 4
(a) For a well centered crystal in the DAC, the apparent offset of the crystal from the center remains unchanged after tilting by 14° in either direction and rotating the DAC by 180°. (b) For a crystal slightly offset toward the microscope, tilting the crystal by 14° and rotating the DAC by 180° will result in a noticeable difference in the transverse shift of the crystal images. The DAC in the centered orientation and at a tilt angle of ±14° and after rotation by 180° are represented by purple and light blue outlines; the corresponding light rays are displayed in red and green. |
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