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The metallicity structure of galactic haloes is one of the major unknowns in   modern galactic astrophysics and observational cosmology. Hereby we outline a   very simple method for obtaining at least a crude picture of gas abundances,   based on recent important statistical determination of the relationship   between neutral hydrogen absorbing column density and galaxy impact   parameter. It is a fine illustration of the great theoretical and   observational power of low-redshift Lyα absorption studies. Future detailed   analyses of large samples of absorption-selected galaxies will certainly   provide us with more data on the abundance structure of extended gaseous   component of galaxies

A comparison of metal and Ly-α absorption in galactic haloes