Summary, Conclusions, Future Work

• Line transfer effects can alter not only line ratios within a given ion, but also across different elements.

• Important for deriving CNO abundances from optically thick sources (e.g., in accretion disks).

• Work in progress.

  • Incorporate Compton scattering.
    • Important in very highly ionized medium where the metal abundances are extremely low, i.e., when AZ  b-f ~ T.
  • Comprehensive / global spectral modeling including all important metal transitions.
    • e.g., Fe XIX - XXIV lines with O VIII continuum ( < 14.2 Å)
  • relativistic effects