a) GOES SXR fluxes of the flare during 15:30−18:30 UT. b) Temporal evolutions of the normalized, integral intensities of the AR within the dashed box of Fig. 1a. c) Temporal evolutions of the 171 Å base-difference intensities of D1 and D2 marked in Fig. 5b. PFD stands for pre-flare dimming. The two vertical dotted lines in each panel denote the start time (15:45 UT) and end time (17:21 UT) of pre-flare dimmings.
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