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Figure 3
Measured intensity profiles of the incident beam at the sample position. The knife-edge scan intensity profiles (open circles) and their derivatives (filled circles) along the (a) vertical and (b) horizontal directions are shown. The solid line in each panel is the theoretical intensity profile calculated by using the Fresnel–Kirchhoff diffraction formula shown in Fig. 2[link].

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ISSN: 1600-5775
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