Space-time (X-T) analysis using the AIA 171 Å image sequence. Panel a: a context image from AIA along with the two artificial slits (white boxes) that we used to derive the X-T maps. Derived maps are shown in panel b for Slit 1 and in panel c for Slit 2. In each of these maps, the slanted, dotted lines (in blue) trace the inclined ridges that correspond to propagating features. Speeds calculated through the slopes of these dotted lines are printed on the panels. Furthermore, two dotted, vertical lines (in white) mark the time period when EUI observations are available, wherein the red horizontal line in panel c marks the location at which the light curve was extracted for wavelet analysis. See Sect. 3.2.2 for further details.