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Fig. 3


Left panel: combined cooling tail in the FL/LEdd vs. K− 1 / 4fc plane with 1σ error limits presented by crosses. Gray crosses show the burst evolution before the touchdown. Best-fit theoretical atmosphere models are shown by blue (SolA001) or red (He) curves. Right panel: temperature evolution of the bursts. Blackbody color temperature Tc is shown for each cooling tail with black crosses. Red (He) or blue (SolA001) crosses show the color-corrected temperatures Teff(1 + z)-1. Dashed lines show a powerlaw with an index of 4 corresponding to the FT4 relation. Highlighted gray area marks the region of the cooling tail used in the fitting procedures.

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