Fig. 13.
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Simulated NewAthena X-IFU afterglow spectrum for an integrated flux of 5 × 10−13 erg cm−2 s−1 (0.3–10 keV). The best-fit absorbed power-law model is overplotted in red. The inset shows the redshift contours, and the dashed line ΔC-stat = 2.706 defines the 90% confidence level for a single free parameter (Lampton et al. 1976). The star indicates the true z used in the simulation.
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