Fig. B.3
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K2 light curve of the O9 Ib X-ray binary EPIC 223217668 (IGRJ 17541–2619), which displays erratic variations typical of a hot, supergiant object, shown in the upper panel. The lower panel depicts the frequency spectrum, displaying both SLF and SPB frequencies. It could be interesting to further analyze the presence and impact of SLF variations in a late O supergiant X-ray binary.
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