Overview of the average PSDs at different spectral shapes. PSDs are calculated on a logarithmically binned grid with df/f = 0.15. Each PSD is the average of all n PSDs falling within the Γ₁ ± 0.01 interval for the given Γ₁ values. Black stars show PSDs in the 2.1–4.5 keV band, red triangles in the 4.5–5.7 keV band, blue circles in the 5.7–9.4 keV, and green squares in the 9.4–15 keV band. The gray line represents the PSD in the total 2.1–15 keV band. The increase in the 2.1–4.5 keV PSDs seen at highest frequencies (especially for Γ₁ = 2.61) is not a source-intrinsic effect, but is due to the high flux in this band and resulting telemetry overflow.