Evolution of the core loops of the AR as seen in the EM-weighted temperature maps. Changes and important structures are marked with white arrows. The influence of the flare on the AR can be especially seen at 08:41 UT (loop b reaches temperature of 7 MK in the first flare phase) and at 08:45 UT (loop c is strongly heated during the second impulsive flare phase). White boxes in the image at 08:46:11 UT are the sub-regions for the temperature analysis (Fig. 7).