Fig. 3.
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Joint evolution of the observed 0.2−2 keV flux (top panel) and the photon index (bottom panel) over time. The dashed red line marks the 3σ flux upper limit inferred from the non-detection in eRASS1. The X-ray spectrum remains ultra-soft (Γ ≳ 4) over the ∼760 days of X-ray monitoring (∼800 days after optical peak; Homan et al. 2023).
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