Observed GIANO-B spectra of two stars each from NGC 7044 and NGC 6819. The HF lines shown in the spectra are 22778.249 Å and 23 358.329 Å. The Ce II lines are 16 595.180 Å and 17 058.880 Å. The solid red line is the synthetic spectra, and the black dots are the observed spectra. The respective effective temperature, metallicity, and fluorine abundances are indicated. Only the HF lines and Ce II lines are fitted.