Close-up view of the important diagnostic lines in the far-UV FUSE spectrum. The observed spectrum is shown as a blue solid line, the weighted synthetic spectrum of the primary and secondary are shown as black dotted and green dotted lines and the combined synthetic spectrum is shown as a dashed red line. In the combined synthetic spectrum ISM absorption lines, which originate from the Galactic foreground and in the SMC, are included. They are labeled as “(is)”. We note that not all ISM lines are modeled, and that FUSE spectra are additionally contaminated by absorption lines from molecular hydrogen.