Simulation-based inference with neural posterior estimation applied to X-ray spectral fitting - Demonstration of working principles down to the Poisson regime

Open Access

Fig. 10

Posterior distributions for reference spectrum of 2000 counts as derived from SBI-NPE with a single-round inference of a network trained with 20 000 samples (green); a multiple-round inference with three iterations in which the network is trained with a sample of 1000 simulations (pink); and by XSPEC (blue).

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