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Fig. 3

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Sequences of AIA  171 Å (panels a)d)), 335 Å (panels f)i) and running difference images (panels e) and j)) during the pre-eruption phase show the brightening on the top of the LA1 (referred to as the reconnection site), cancellation of LA1 and formation of the PRLA. Dotted white rectangles and arrows on panels e) and j) indicate the eruptive region and the direction of the eruption. Hα images (panels k) and l)) show filament threads (marked by white arrows) and their activation. Panels m)o) are the time-distance diagrams of the eruptive filament as observed in the 335 Å, ROSA, and ISOON Hα lines plotted along cut  1, 2, and 3 in panels i) and k). The vertical dashed line (panels m)o)) indicates the start time of the eruption (16:24 UT). White arrows (panels m)o)) indicate the upward (eruptions) and downward (draining) plasma streams passing cuts 1, 2, and 3 in panels i) and k).

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