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. 2017 Aug 8;4(Pt 5):626–638. doi: 10.1107/S2052252517010259

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© Parkhurst et al. 2017

This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

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The fourth acentric moments of E, the normalized structure factors, versus resolution for data sets (a) 4puc, (c) 4ef1 and (e) 4kw2. The red line indicates the default background algorithm and the blue line indicates the new global background-model algorithm. The expected value for untwinned data is shown by the theoretical curve in black. The R _free versus resolution for data sets (b) 4puc, (d) 4ef1 and (f) 4kw2. The red line indicates the default background algorithm and the blue line indicates the new global background-model algorithm.