Sequence of the Ca II 8542 Å wideband (Col. 1) and narrowband (Cols. 2–8: −0.5 Å, −0.11 Å, −0.06 Å, the Ca II 8542 Å line center, +0.06 Å, +0.11 Å and +0.5 Å) images of the ROI, including DS maps at Ca II±0.5 Å (Col. 9). Respective times of observation are shown along the right ordinate. Some arc-shaped propagating bright features are indicated with arrows in Col. 7. This figure is accompanied by a movie.