Long-term X-ray evolution: unabsorbed 2–10 keV flux/luminosity, hydrogen column density (N_H), power-law index (Γ), inner disk temperature (T_in), and inner disk radius (R_in). Open symbols indicate fixed diskbb values. Different symbols correspond to different instruments. The solid red line represents the best-fitting FRED model (excluding the pre-outburst EP/WXT upper limit). Luminosity and R_in are calculated assuming D = 8 kpc, M = 10 M_⊙, and i = 58° (Table D.2).