Fig. 2.
Power density spectra extracted from NICER (0.5−5 keV) and NuSTAR (3−20 keV) data. The red solid lines mark the best-fitting model to the power spectra (see text for details). The best-fitting values for the power-law index, the rms variability amplitudes below 1 Hz and the 
values with the d.o.f. of the fits are also shown. Post-fit residuals are shown in the bottom panels. Uncertainties are at 1σ c.l.
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