Impulsive heating in the core of AR 12713. The format is the same as in Fig. B.6. Bottom left panel: IRIS SJI 1400 Å map in an inverted grey scale. The dashed region outlines the spatial extent of raster observations in this case. The circular region from the top panels is overlaid. The magenta plus symbol marks a feature at the edge of the circle. Lower right panel: Si IV 1394 Å spectral profile at the location of plus symbol. The profile is saturated due mainly to the 60 s long exposure time used in this observation. AIA light curves are shown at lower cadence. Animation of panels a–g is available online.