Fig. 3
Her X-1 pulse-phase-averaged cyclotron line energies Ecyc normalized to the reference time MJD 53 500 using a time dependence of −7.22 × 10-4 keV d-1. The new time-normalized NuSTAR 2015 value is 37.49 ± 0.24 keV. The solid line defines the linear best fit for the flux dependence of Ecyc with a slope of 0.44 keV/(ASM-cts/s).
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