a) Focusing factor of the simulated rings. b) Predicted 3σ detection sensitivities for continuum emission, assuming an exposure time of ΔT = 100 ks and ΔE/E = 1 / 2. The background was set at 1.5 × 10-4 counts cm-2 s-1 keV-1, taking into account the average detection efficiency ηd = 0.5 and the average attenuation factor fat = 0.9.
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