Evolution of dynamic fibrils. Space–time (X − T) maps for slit-1 (left column), slit-2 (middle column), and slit-3 (right column) are displayed. The top X − T map in each column is from the HRI_EUV data sequence, followed by the maps from AIA 171 Å, IRIS 1400 Å, and IRIS 2796 Å data. In each column, the cyan curves outline the parabolic fit to the bright tracks, as seen in the corresponding EUI X − T map. Tracks marked with Letter ‘X’ are discussed further in Sect. 3.1.