(a)−(f): HRI_EUV 174 Å sequence images showing the production of two current sheets. (d1)−(f1): Schematic diagrams of the evolutionary sequence of filament 2, corresponding to the respective time instances shown in panels d−f. (i1)−(i3): Time-distance diagrams along the direction of the cyan arrows in panel f. The dashed black line outlines the post-flare loop after the eruption of filament 2 in panel f. The dashed red line in panel i3 represents the position from which the light curve was extracted for wavelet analysis, with the results presented in Figs. 7a1−7a3.