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Figure 6
(a) Real world performance of the IRIXS Spectrograph (solid lines) is compared with ray-tracing simulations (dashed lines) for an incident beam E0 = 2840 eV and bandwiths of 600 meV and 30 meV. The intrinsic resolution was simulated by using an incident bandwidth of 1 meV. (b) The spectral response and mm-to-meV conversion was determined by systematically changing the incident energy in 13.4 meV strides and measuring the according shift in position on the detector. (c) The relationship between energy and position is linear, which was fitted, giving 16 meV mm−1. (d) The image remains in focus across the entire response function, although it degrades slightly at the edges of the window.

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