Spectral synthesis of the C₂ molecular band regions (λ5128 and λ5165) and of the C atomic lines (λ5052.2 and λ5380.3) for Ganymede of the second observation run (top panels) and for one metal-rich star of the first run, HD 160691 (bottom panels). The solid lines represent three models with different values of [C/Fe]: −0.05 (red), 0.0 (green), and +0.05 dex (blue). The differences between observed (dots) and computed spectra (o−c) are also shown in the bottom of each panel.