Modeling of the 4–12 keV (left) and 12–25 keV (right) flux on the exponential rise after the main Her X-1 turn-on, error bars correspond to 500 s data binning. Green filled circles mark the initial rise time of the X-ray flux T₀ (falls inside interval #34 in Fig. 6). Red dots are ignored as they correspond to the X-ray flux dip caused by the expected inhomogeneous gas stream from the Lagrangian point L₁. In the bottom panel, black dots with error bars show the difference between the observed and model count rate.