Fig. B.1.
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Frequency-resolved phase lags (left) and coherence (right) of 1A 0535+262 on Day 7. Reference bands are 0.2–2 keV (NICER) and 1–3 keV (HXMT/LE). Subject bands (top to bottom) are NICER 5–8 keV, HXMT/LE:5–10 keV, HXMT/ME:27–35 keV, and HXMT/HE:50–65 keV. A transition from symmetric, modest bumps to sharp ‘cliff’ structures is evident as energy increases, indicating the emergence of more pronounced QPO signatures in higher-energy bands.
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