Display of the selected pixels that correspond to transient brightenings in 1600 Å (green), 3 mm (red), and 304 Å (blue) target 4 data. Top row: all events detected at a given wavelength are denoted. Bottom row: panels e and f show only the events that appear both at 3 mm and 1600 Å, respectively, while panels g and h show only the events that appear both at 3 mm and 304 Å, respectively. In each panel the relevant average image is shown as background.