HST STIS observations of four QSO pairs

We present HST STIS observations of four quasar pairs with redshifts 0.84 200 km/s. This probably reflects the fact that the scale probed by our observations is not related to the real size of individual absorbers but rather to large scale correlation. Statistics are too small to conclude about any difference between pairs separated by either 2 or 3 arcmin. A damped Lyman_alpha system is detected at z_abs = 1.2412 toward LBQS0019-0145A with log[N(HI)] ~ 20.5. From the absence of ZnII absorption, we derive a metallicity relative to solar [Zn/H]<-1.75.