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Ultraviolet Survey of CO and H<sub>2</sub>in Diffuse Molecular Clouds: The Reflection of Two Photochemistry Regimes in Abundance Relationships
(Abridged) We carried out a comprehensive far-ultraviolet (UV) survey of ^12CO and H_2 column densities along diffuse molecular Galactic sight lines in order to explore in detail the relationship between CO and H_2. We measured new CO abundances from HST spectra, new H_2 abundances from FUSE data, and new CH, …