Benchmark A₂ extraction of sources with getsf and getold. The original ℐ_​λ are overlaid with the footprint ellipses from the measurement step. In the getold extraction (bottom), the nonexistent large-scale background was determined and subtracted in a preliminary run of getimages, in order to keep the general extraction scheme unaltered for all benchmarks. The images are displayed with a square-root color mapping.