Spectral energy distributions of stripped stars with different metallicities. The masses of the stripped stars range from 0.35 M_⊙ up to 6.7 M_⊙. Colors indicate the different groups with morphological similarities: Group A: absorption line spectra (purple), Group E: emission line spectra (green), and Group A/E: spectra with a mix of absorption and emission lines (blue). We mark the ionization limits of HI, HeI and HeII with dashed lines.