(a) Cross-sectional intensity profile of L2 before the onset of the dimming (blue) and after the subsequent rebrightening (red). Note that both width and amplitude of the profile remain nearly constant. (b) Typical cross-sectional profiles overlaid with colors corresponding to their respective times, showing a gradual deepening of the intensity dip attributed to the evolution of dimming strands. The dimming strands spans (peak-to-peak distance) about 3-4 pixels (384-512 km).