Fig. 3.
Normalized spectra comparing the intrinsic absorption features in Mrk 509 from the COS G140L spectrum obtained in 2012 (red) to FUSE spectra from 1999 (black) and 2000 (green). 1-σ error bars are attached to each COS spectral point. Relative fluxes are plotted as a function of observed wavelength. The Lyβ and O VI absorption troughs in Mrk 509 are labeled. Other dips in the spectra are foreground galactic interstellar absorption lines.
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