Example of spectral synthesis method showcasing the fitting of prominent spectral features including molecular carbon (C₂) band head located at 5135 Å, molecular CN bands at 7995 and 8003 Å, alongside the atomic forbidden oxygen line [O I] at 6300 Å. The observed spectra are represented by black dots, while the solid green lines denote the optimal fit of synthetic spectra to the observed data along with variations of ±0.10 dex from the optimal fitted abundance.