UV (top, middle) and optical (bottom) spectrum of the SMC star Sk191 (B1.5 Ia). The UV spectrum consists of FUSE, STIS E140M, and STIS E230M observations compiled as part of the ULLYSES project. The optical spectrum was obtained with X-shooter. Similarly to Fig. 9, interstellar transitions and a selection of stellar and wind diagnostics are highlighted. In addition, metallic lines that can be used to measure abundances are marked in purple.