The 1B (left) and 2A (right) detectors plotted in the cross-dispersion direction. The data were reduced as extended source, and were binned with a factor 128 in x and 8 in y, to a 128 × 128 pixel sized image. The data are summed over the pixel intervals x = 10–20 (upper), x = 50–60 (middle) and x = 100–110 (lower). The original signal is plotted in gray, with three different background fits overplotted in black: Λ_x = Λ_y = 0.5 (solid), Λ_x = Λ_y = 2.0 (hatch/dot, and Λ_x = Λ_y = 6.0 (hatched). The SiC spectra are centered at y pixel  ~10 for 1B and y pixel  ~50 for 2A, while the LiF spectra are centered at  ~70 for 1B and  ~92 for 2A. The narrow dips and peaks that are the most prominent on the 1B detector are artifacts of pipeline processing (Dixon 2007, priv. commun.).