Synthetic fits for the 8000-Å CN region of λ And (gray shaded region is excluded for the fits). The diamond symbols are a phasemedian spectrum corrected for telluric contamination. The lines are fits with three different ¹²C/¹³C isotope ratios. The figure represents only one example of fits. Stellar parameters were kept fixed to (T_eff, log g, [Fe/H], ξ_t, v sin i) = (4660, 2.80, −0.59, 2.00, 7.1) in the usual units using a relative nitrogen abundance ΔA(N) of −0.40. In the case shown, we used the atomic and molecular line list of Plez (2012). The adopted best average from six parameter combinations is ¹²C/¹³C=30±5 (the fit shown in the plot is with an isotope ratio of 31).