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Figure 2
(a) Schematic outline of the experimental setup used for the experiment described by Kharitonov et al. (2021BB26). The FEL beam was focused using KB mirrors, thus creating a divergent probe geometry. A restricting aperture was used to limit spatial fluctuations. The sample was placed after the focus. Values in brackets correspond to the setup used with the PERCIVAL detector in 2020. (b) Optical microscopy image of the sample. Two scanned areas, one highlighted in a magenta square and one in green, were used. The magenta area indicates non-symmetric structure made up of letters and the green area bright and dark lines that radiate from a common center. Comparison of typical diffraction patterns measured with (c) the PERCIVAL detector and (d) the CCD camera reported by Kharitonov et al. (2021BB26). Photons with approximately two orders of magnitude intensity and higher diffraction angles were captured with the PERCIVAL detector compared with the typical measurements in (d). Achieving the same dynamical range in (d) demands an increase in intensity and, consequently, a beamstop. The green scales in (c) and (d) show the maximum measured angle of diffraction in Fourier (q) space.

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