Fig. 8.
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Luminosity–phase–lag relation of the millihertz QPO in 1A 0535+262. ΔϕQPO in different energy bands (colours as in Fig. 5) versus bolometric luminosity. The light blue shaded region indicates the transition range, Lrev ∼ 1.11 − 1.16 × 1038. A transient soft lag appears only for L ≳ Lrev. All QPOs were fitted with a single-component model.
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