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Fig. 7

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Temporal evolution of the thermal source volume Vdir for all 24 flares. For comparison, the upper parts of the individual plots show the HXR lightcurves in the 6−12 keV (thermal; black line) and the 50−100 keV channels (nonthermal; gray line), respectively, in units of counts per second and detector. The dashed lines denote the time of the GOES SXR peak flux in the 1−8 Å band.

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