Examples of a secure (top; “A” quality; ID 225039) and an uncertain (bottom; “C” quality; ID 240680) redshift. In each case, the black curve shows the observed spectrum, with error in gray, and the red one the best-fit model. The inset shows the inverse of the reduced χ², with the best-fit solution marked by a red vertical line. Each spectrum has been rebinned to a width of 5 pixels.