FUSE spectrum of PG 1520+525 (thin black line) compared to a photospheric model spectrum (thick red line) with the finally adopted parameters as listed in Table 1. Prominent photospheric spectral lines are identified. Uncertain identifications are given in brackets. Unidentified, probably photospheric, lines are indicated by question marks. Geocoronal emission in the center of Lyman β was cut out. Overplotted in blue is the same model including ISM lines.