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Fig. 3
2–4 keV (middle) and 4–9 keV (bottom) RXTE PCA background-subtracted light curves for an archival GX 13 + 1 observation with a binning of 16 s. Top: hardness ratio (counts in the 4–9 keV band divided by those between 2–4 keV) for the RXTE PCA light curves shown in the middle and bottom panels.
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