The apparent energy-dependent frequency shift of the ~6 Hz QPO in GRS 1915+105 is better reproduced by two fixed-frequency Lorentzian components, a QPO and a QPO shoulder, with distinct fractional rms and phase-lag energy spectra.
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Complex Energy-Dependent Behaviour of Quasi-Periodic Oscillation Observed in GRS 1915+105
The apparent energy-dependent frequency shift of the ~6 Hz QPO in GRS 1915+105 is better reproduced by two fixed-frequency Lorentzian components, a QPO and a QPO shoulder, with distinct fractional rms and phase-lag energy spectra.