Overlay of QSLs (with Q> 104) obtained from the data-constrained magnetic field model (Sect. 5) with the flare ribbons seen in different filters (304 Å and 1600 Å). a) Overview of the fan region with large circular flare ribbons best seen in 304 Å, matching the QSL photospheric traces for the stable model S (iteration n = 40 000). b) Same field of view but at a later time during the peak of the flare (22:17 UT) with the QSL photospheric maps obtained for the unstable model U (iteration n = 30 000). c) Zoomed-in view of the ribbons and QSLs where the filament f1 is found, and where the electric current density is calculated (Fig. 3) for model S and compared with the flare ribbons seen in the 1600 Å, where they appear less saturated. d) The same for model U. The similarities between the ribbons and traces of QSLs in the filament region are indicated with white arrows.
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