Open Access

Fig. 13.

image

Correlation between the best QPO fitting parameters and the count rate, in each of the 200 s intervals of Fig. 12. We fitted each PDS between 4 and 10 Hz with a Lorentzian added to a straight line with a constant gradient. The properties of the Lorentzian were extracted to determine the centroid frequency, quality factor, and fractional rms in the QPO.

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