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Figure 2
Same form factor modulus as in Fig. 1[link], for [{{\hat{\bf q}}} = (0.6,0.8,0)], now in a double logarithmic plot, computed in double-precision arithmetic according to the closed expression (9)[link] with c = 0. For some small q, the results are totally wrong owing to imperfect cancellation in the leading-order term that ought to vanish.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 54| Part 2| April 2021| Pages 580-587
https://doi.org/10.1107/S1600576721001710
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