Bottom panel: pulse profile of NGC 300 ULX1, using the 2016 XMM-Newton/EPIC-pn (black, and red lines; 0.3–10.0 keV) and NuSTAR data (green lines; 3.0–30.0 keV). ON-pulse and OFF-pulse spectra were extracted from the gray shaded areas, which have a width of 0.3 in phase. Top panels: XMM-Newton HR1: 0.3-2.0 vs. 2.0-4.5, HR2: 2.0–4.5 vs. 4.5–10.0, and NuSTAR HR3: 3.0–10.0 vs. 10.0–20.0.
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