Line profiles of Fe XII for various times and windows of the same size as the smallest one in Fig. 4 (0.5 Mm × 0.5 Mm). Rows are times: t = 40, t = 60, t = 72, t = 92. Columns are position across the loop (all at the same height): centre is in the centre and adjacent to it are windows adjacent on either side. The far-left and far-right plots are for windows located immediately inside the largest viewing window of Figs. 1b and 2.