Fig. 6

Leahy normalized power-density spectrum evaluated averaging spectra computed over 8 s long intervals of the EPIC-pn observation, and rebinning the resulting spectrum as a geometrical series with ratio equal to 1.04. A white-noise level equal to 1.99(1) has been subtracted. The solid line represents a power law, P(ν) = ν− α with index α = 1.05.
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