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Figure 4
The variation of quality within crystals. (a) Comparison of variability measures of crystals. Values of V1 and V2 are plotted against each other and coloured by KDE. Lines show the values obtained for various ratios N between positions at increasing differences in diffraction power (for an explanation of the model, see Bowler & Bowler, 2014BB11). The red line representing the ratio N = 5 is a reasonable cutoff between variable and homogenous diffraction within crystals. N = 15 864. (b) Mosaic spread values plotted against ratios N. Greater variability within a crystal is not related to higher mosaic spread values, Spearman R = −0.13, N = 13 780. (c) The molecular weight has no effect on the degree of variability, Spearman R = −0.06, N = 15 188. (d) Obtained resolution against ratios N. Higher variability is weakly correlated to higher resolution, Spearman R = −1.9, N = 15 188.

IUCrJ
Volume 6| Part 5| September 2019| Pages 822-831
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519008017