Data delivery example: 8000-Å CN region of HR 5844. Diamond symbols are the observed spectrum and the lines are fits with three
different 12C/13C isotope ratios, using the CN line list of Plez. The best average from eight fits is 12C/13C=17.8 using a relative nitrogen abundance of 0.50±0.05 and a relative iron abundance of –0.25±0.03. Average S/N per pixel of this PEPSI spectrum in this wavelength range is 400.