well represented by a De Vaucouleurs radial profile with effective radius $r_e = 1\farcs5 \pm 0\farcs7$ and surface brightnesss $I_e = 24.9 \pm 0.4$ mag/arcsec$^2$, and by elliptical isophotes with ellipticity $e_G = 0.20 \pm 0.02$ and position angle $\Phi_G = 71^\circ \pm 5^\circ$. Thus, we conclude that G is most likely an elliptical galaxy, whose redshift unfortunately remains unknown.

Our lens models qualitatively account for both the compact QSO images and the arc. However, we could not find any models that were simultaneously consistent in detail with the HST positions of the images of the core and with their (unvarying, and unaffected by microlensing) radio flux ratios, as given by KH93. Monitoring of the images of   at radio frequencies shows variations at 15 GHz of only $\leq 3.5$% on time scales of 6 months (MH96). Thus, the discrepancy between observed and predicted flux ratios exhibits a serious deficiency of our models.

There are significant differences between the color of the images of the core QSO source, $R_{\rm core}-I_{\rm core} = 2.2 \pm 0.1$ mag, and that of the arc, $R_{\rm arc}-I_{\rm arc} = 1.3 \pm 0.3$ mag. The latter color appears to be invariant along the length of the 