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. 2011 Jan 29;18(Pt 2):134–142. doi: 10.1107/S0909049510054452

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© V. N. Strocov et al. 2011

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

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Resolution plots as a function of α for r ₁ = 600 mm (a) and as a function of r ₁ for α = 88.2° (b) calculated with Δα increasing from 1 to 6 mrad in steps of 1 mrad. The SP valley narrows, but ΔE at its bottom increases only marginally.