Fig. 9.
Comparison of the complex low-energy pulse profile in the roughly 2–6 keV energy range from observations taken decades apart with three different X-ray missions, SAS-3, EXOSAT, and BeppoSAX, respectively. The data points have been taken from McClintock et al. (1976), Raubenheimer (1990), and La Barbera et al. (2003), but shifted in phase and scaled arbitrarily for a visual match.
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