  The far-ultraviolet spectrum of the DAO White Dwarf LS V+4621, the exciting
star of the possible planetary nebula Sh 2-216,is strongly contaminated by
absorption features from the interstellar medium (ISM). For an ongoing spectral
analysis, we aim to extract the pure photospheric spectrum in order to identify
and model metal lines of species which are not detectable in the
near-ultraviolet wavelength range.
  We have modeled the interstellar absorption precisely and considered it for
the simulation of the FUSE (Far Ultraviolet Spectroscopic Explorer)
observation. A state-of-the-art NLTE model-atmosphere spectrum which includes
16 elements is combined with the ISM absorption and then compared with the FUSE
spectrum.
