Time-distance diagram along the dashed white curve in Fig. 1 (right panel) for the April 1st HRI_EUV observation. The distance 0 corresponds to the western end of the curve. The curve crosses a loop bundle at the apex, which is seen to undergo a large-scale reconfiguration (radially inward, corresponding to shrinkage), as pointed out by the arrows. This time-distance diagram is made from images that have been processed with the wavelet-optimised whitening enhancement technique of Auchère et al. (2023).