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Figure 1
The outliers are included in the histogram (frequency versus calibrated intensity) to show the cut-off threshold of the robust and non-robust algorithms and contrast how each approach models the background. In this example, to compare robust and non-robust methods (see text), PF8 misses some of the weaker Bragg peaks because of its sensitivity to the presence of outliers in estimating the background model.

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APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
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