Fig. 3.
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Observed cyclotron line energy as a function of X-ray luminosity. Red data points denote the inverse-variance weighted average of the cyclotron line energy. Gray data points have been excluded from the averaging. The data for the top three panels have been collected by Staubert et al. (2019) and stem from Caballero et al. (2007), Sartore et al. (2015) and Fürst et al. (2015). The data for the bottom panel have been directly obtained from Chen et al. (2021).
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