Pre-flare magnetic field structures involved in the remaining HXR peaks. Panels a and b show the main fields that became involved in HXR peaks 2 and 3, respectively. Panels c and d show all field lines seeded during any HXR peak in the positive and negative polarity, respectively. Field lines from the first (1) and last (6) HXR peak are colored the same way as shown in Fig. 9 while those from the HXR peaks in between are shown as blue and red.