Cyclotron line centroid energy Ecyc as a function of the logarithm of flux in the 4−80 keV range. The error bars indicate 1σ-uncertainties (the flux uncertainties are smaller than the symbol size). The top X-axis represents the corresponding isotropic source luminosity assuming a distance of 2.4 kpc. The dotted line shows a linear fit to the Ecyc–log10(Flux) dependence.
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