Example images in EIT's four narrow UV bands, taken between 00:00 and 01:19 UTC on January 1, 2003. The intensity in each of these images is scaled logarithmically. The 304 Å band (upper left) observes the chromosphere and transition region, including HeII emission. The 171 Å (upper right), 195 Å (lower left), and 284 Å (lower right) bands observe progressively higher and hotter layers of the transition region and corona, designed to capture Fe IX–X, Fe XII, and Fe XV emission, respectively (Delaboudinière et al. 1995). In quiet periods, the 284 Å band is also contaminated by cooler material, because it overlaps with lines of Mg VII (see, e.g., Young 2023).