Fig. 5
Upper panel, left scale: Her X-1 pulse phase averaged cyclotron line energies Ecyc normalized to a reference ASM count rate of 6.8 cts/s using a flux dependence of 0.54 keV/ASM-cts/s. A break in mean Ecyc after MJD 54 000 (>2006) is apparent. Lower panel, right scale: 2–10 keV X-ray flux (of 35 d maximum) from monitoring by RXTE/ASM (from Swift/BAT after MJD 56 000). Blue data points with uncertainties are those fluxes which are used to correlate with Ecyc, the green curve connects measurements of each 35 d cycle.
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