Fig. 3.
Bright phase QPO frequency profiles. Mean power density spectra are shown in the range of 0.1–3 Hz for the bright phase interval 0.75–1.15, excluding B4, in the three wavelength bands (top: r′, middle: He, bottom: u′). The Y-scale is the power computed with Leahy normalisation. The red line shows the subtracted background fitted as a power-law outside the 0.5–1 Hz interval.
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