Fig. 1

Lightcurves from the Rossi-XTE PCA, background-subtracted and deadtime-corrected of the 3 sources with 64 s binning. Upper panel: GX 349+2; upper middle panel: typical Sco X-1 data with strong flaring; lower middle panel: Sco X-1 in an exceptionally flare-free state; lower panel: GX 17+2; the gaps between the 4 sub-observations are removed for clarity.
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