TurboMPfit for the 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. Fixed parameters were (Teff, log g, ξ_t, υ sin i) = (4296, 1.54, 2.00, 4.53) in the usual units. The best average from eight fits is ¹²C/¹³C = 17.8 using a relative nitrogen abundance ∆A(N) of 0.50±0.05 and a relative iron abundance of –0.25±0.03 (the best fit shown in the plot is with a slightly different isotope ratio). A total of 41 pixels were fitted to a χ² of 575. Average S/N per pixel in this wavelength range is 400.