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Figure 1
A graphical illustration of the definition of Chkl according to equation (7)[link]. The solid line shows an arbitrary Γ(hkl, D) function extending over two unit cells (one unit cell on the positive and one unit cell on the negative side of the D axis). The dashed horizontal line shows the threshold value of ρS = 0.75ρ0. The regions of Γ(hkl, D) < ρS are filled by colour. The numerator of equation (7)[link] is equal to the area inside the coloured region.

IUCrJ
Volume 8| Part 5| September 2021| Pages 793-804
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521007272