Relations between the physical quantities used to match the observation and the fitted parameters. Panel a: Relations between the flux (4 ∼ 23 keV) and the temperature of the seed photons. The observed flux is marked by the plus, the model calculated flux is marked by the cross, and the flux marked by the star is obtained using the same parameters, which are the central values of the parameters for the twin kHz QPOs with the frequencies (ν_l = 883.44 ± 1.10 Hz, ν_u = 1132.73 ± 6.47 Hz) in Table B.1, except for the changed kT_b. Panel b: Relations between the calculated rms ratio and the temperature of the seed photons. Panel c: Relations between the calculated rms ratio and the temperature of electrons. Note: The data in panels (b) and (c) were obtained when the parameters in Table B.1 for the above twin kHz QPOs were kept unchanged, except for kT_b in panel (b), or were kept unchanged, except for kT_e in panel (c).