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Figure 2
Spatial distribution of an undulator radiation on a screen at 27 m from the source, calculated with SRW wavefront propagation (left, top and bottom) and the ray-tracing reconstruction with Shadow (right, top and bottom) at the resonant energy of the first harmonic E1st = 5 keV (top-left and bottom-left), and at the red-shifted energy Ers = 4.95 keV (top-right and bottom-right). The undulator used in this example is U25 at APS-U described later in Table 2[link].

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