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Fig. 7

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Ratio of the kHz QPO rms amplitude after the burst over its value before the burst (see Table 2) as a function of the burst peak luminosity (upper left), burst total energy (upper right), maximum fa (lower left), and mean fa during the first 20 s (lower right) with 1σ error bars. The upper limits are 90% level. The blue circles correspond to bursts of 4U 1636-536, the red squares to bursts of 4U 1608-522. When no significant signal was detected, upper limits were plotted (bursts 4, 22, and 23 of 4U 1636-536).

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