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Figure 2
(a) Rocking curves in (left) the incident condition and (right) the exit condition for the first crystal at 12.4 keV with absorption. α = 6° and b = 0.21 in equation (3[link]), where ωs, ωo and ωg represent the intrinsic Darwin width in the symmetric case (α = 0°), the incident acceptance and the exit reflectance, respectively. (b) DuMond diagrams in both symmetric and asymmetric geometries, where [\theta _{1}^{\,\rm in}] and [\theta _{1}^{\,\rm out}] represent the incident and exit angles on the first crystal, respectively. The same applies to [\theta _{2}^{\,\rm in}] and [\theta _{2}^{\,\rm out}] on the second crystal.

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