Spatial variability along a cut through a diffuse region, loop-like features, and a coronal bright point at four different times. This intensity–distance plot shows the intensity along the cut outlined by the black vertical line in Fig. 1b for several intervals of time during the observation. For each 30 s interval (15 time-consecutive images), the intensity at each pixel along the cut is averaged over that time period and plotted as a function of distance. Four of these light curves are shown as a stack: the bottom curve is the intensity–distance 30 s average (starting at 30 s) ending at 1 min, the curve directly above it is the 30 s average ending at 10 min, and so on. The black vertical bars with each curve show the maximum error for that curve (see Appendix A). Above the panel the location in the y direction of the three types of regions are labeled (see Sects. 3.2 and 4.1).