Temporal evolution of cut through the diffuse region and coronal bright point. This time–distance plot shows the intensity in HRI_EUV from along the cut (1 pixel in x) outlined by the black vertical line in Fig. 1b as it evolves over the entire 25 min observing time. The intensity is scaled linearly from 915 DN s⁻¹ (black) to 2500 DN s⁻¹ (white). Above the panel the location in the y direction of three types of regions are labeled. The two arrows indicate transient brightenings in the diffuse region (see Sects. 3.1 and 4.2).