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Figure 1
Effect of dark-current correction on the raw attenuation signal for metallic Mo. The thickness chosen corresponds to a log ratio of 4, emphasizing the qualitative distortions which remain present down to and below log ratios of 2. Many users feel that they have an accurate undampened structure, but should explicitly include the influence of dark current and avoid the structural modification. Dark-current levels of up to 1000–4000 counts per second have a very large impact even on an almost perfectly thin sample with perhaps 106 counts s−1, especially on relative amplitudes, peak locations and structural solutions at the 0.1–0.4% level, although less visible to the eye than this example.

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