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Figure 4
Distribution of the Friedel differences as a function of the standard uncertainty of the corresponding observed difference, σ(Do). The left plot is for SL-6418, right for Motherwell. The green line is the percentage frequency of Ds/σ(Do), i.e. an estimate of the theoretical signal:noise distribution which could be expected from the sample. The red line is the frequency of Do/σ(Do), i.e. the actual signal:noise. The broader the green distribution, the better the potential usefulness of the data. For SL-6418 there are many observations in the end bins (D > 3σ(Do)). For Motherwell the green curve only spans ± 1. The red curve has a much broader spread, indicating that random noise is a major contributor to Do.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 72| Part 5| October 2016| Pages 661-683
https://doi.org/10.1107/S2052520616012890
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