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![[Figure 2]](ic5107fig2mag.jpg)
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Figure 2
Summed images of an aluminium powder pattern recorded during oscillation of the grid. Reflections on or near the rotation axis stay in reflection conditions and thus have the strongest intensity on the ring. Likewise, a reflection-free segment on the rotation axis stays reflection-free during rotation. The minimum on the ring is easier to see than the maximum. Therefore, the rotation axis is determined by a line through the ring minimum and the direct-beam position. |
![[Figure 2]](ic5107fig2.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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