mass distribution (or the amount of shear) is large, about twice that of the light from G. The ellipticities of the critical curves straddled by the images of the core in Figure 7 are indicative of the discordant ellipticities of the light and matter in G. The position angles of our mass models are misaligned by only $\sim 6^\circ$ (within our standard errors) with the orientation of the light distribution of G. Such ellipticity discrepancies are common for models of quadruple lens systems (Kochanek 1996a). Possible explanations are external shears due to, e.g., nearby objects, or local effects, such as triaxiality (Kochanek 1996b, private communication). “Reasonable” modifications of the profile of the mass distribution of G are not expected to eliminate such discrepancies.

Determination of the redshift of the lens galaxy G is a very important missing ingredient for further analysis of . Such an estimate could be used to derive useful physical properties of the lens and of the lensed QSO, such as masses and linear sizes. For example, for models C and D, given the errors in the estimates of the positions of the core images, the mass of G within a radius of $\sim 1\farcs2$ is $M_G 