Left panel: distribution of galaxies and H i in the Dorado galaxy group (see Kilborn et al. 2005, and references therein). Intervening Si iii absorption is observed at z = 0.0037 (cz = 1109 km s^-1) towards the QSO 1H4019−577 (black filled circle). The absorption most likely is associated with the CGM of one group member or with the intergroup medium. Right panel: zoom-in for the region around the two group members F157−081 and NGC 1574; the absorber could be associated with either or both of these galaxies given its velocity and projected distance to each of the systems.