Evolution of the braiding strands on 22 June 2010 (Event 2). Panel a: SDO/AIA 193 Å images. Panels b–c: bicubic-upscaled versions of the PSF-matched AIA 193 Å images and ML-upscaled versions of the AIA 193 Å images, on which the various coloured dotted lines indicate the various recognizable strands. Panels d–e: images of and , where the and are the Fe XVIII intensity of I(94 Å) − I(211 Å)/120 − I(171 Å))/450 smoothed with a Gaussian kernel of 1 and 4 min, respectively. These images were taken at the peak time of the hot emission indicated by the brown box in panel d, which is only one hot emission identified from 00:35:08 UT to 00:45:08 UT. The brown box is also plotted in the other panels. Panel f: vertical component (B_r) of the photospheric vector data from SDO/HMI. All images have the same FOV. The evolution of the braiding strands is shown in a movie (anim4.mpeg) available online.