HST/COS spectrum of the white dwarf in UCAC2 46706450 (gray) compared to a photospheric model spectrum (blue graph: T_eff = 105 000 K, log g = 7.4) with the measured metal abundances (Table 1) and assuming solar H and He abundances. The same model attenuated by interstellar lines is plotted in red. Prominent photospheric lines are identified. Identifications in brackets denote uncertain detections. Question marks indicate unidentified photospheric lines.