The effect of interstellar dust reddening shown in color for a stripped star (left) and a possible companion star (right). Green, purple, and pink show the spectra reddened using extinction laws for the Milky Way, the LMC, and the SMC, respectively (see Cardelli et al. 1989; Gordon et al. 2003). We have applied E(B − V) = 0.5 mag for all considered environments. Black shows the unreddened spectra. We shade the ionizing part of the spectra in gray.