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Fig. 7
Comparison of spectral features in the COS (black) and STIS (red) spectra of Mrk 509. Normalized relative fluxes are plotted as a function of velocity relative to the systemic redshift of z = 0.034397. The individual panels (from top to bottom) show Lyα, N vλ1238, N vλ1242, C ivλ1548, and C ivλ1550.
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