Left panel: pulse profiles of SMC X-3 obtained from the EPIC-pn data in different energy bands. The profiles are background subtracted and normalized to their average count rate (from bottom to top: 4.33, 7.90, 12.6, 10.9, and 8.68 cts s−1). Right panel:hardness ratios derived from the pulse profiles in two neighboring standard energy bands as a function of pulse phase.The red horizontal lines denote the pulse-phase-averaged HR.
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