The signal in the 2A detector segment plotted over the whole x range, summed over row pixels y = 37–43 (left panel) and y = 97–103 (right panel). The left panel samples the background and background fits just below the SiC spectrum, while the right panel samples the background and background fits just above the LiF spectrum. The original signal is plotted in gray, and three different background fits are overplotted: Λ_x = Λ_y = 0.5 (solid), Λ_x = Λ_y = 2.0 (hatch/dot), and Λ_x = Λ_y = 6.0 (hatched).