Plot of quasar impact parameter vs. SDSS r-band Petrosian radius, for the list of absorbers. The line at 38 kpc represents the impact parameter out to which low- z DLAs have been found by Rao et al. (2003). The three curved lines indicate the ratio of the impact parameter to the r-band Petrosian radius (1, 2, and 5, respectively). The vertical striping apparent in the data at low Petrosian radii is a result of multiple QSO sightlines being found within the 100 kpc search radius of a low-redshift galaxy. The absorbers marked with "E" and "Z" represent the four extragalactic absorbers, and the Zych absorber, discussed in Section 5.