UV (top) and optical (bottom) spectrum of the LMC star Sk-67 167 (O4 Inf+). The UV spectrum consists of STIS E140M observations taken as part of the ULLYSES project and archival FUSE data. The optical spectrum was obtained with X-shooter. A selection of diagnostics for stellar and wind parameters are highlighted. Note that these diagnostics can vary with spectral type. The ticks at the bottom of the UV spectra mark the position of interstellar lines.