Table 4: Fitted values of the parameters of simple mass models (see text for details). For each model, the first (resp. second) line gives the results when fitting (resp. not fitting) the lens position (LF; resp. NLF). $\theta _{\rm E}$ is the angular Einstein radius, $\varepsilon $ the intrinsic ellipticity, $\gamma $ the external shear, $\theta _\varepsilon $ and $\theta _\gamma $ the position angles, $(\Delta _\alpha ,\Delta _\delta )$ the differences between the modeled and the observed lens positions in $\alpha $ and in $\delta $.

Model		   $\theta_{\rm E}('')$ $\varepsilon $ $\theta _\varepsilon $(PA) $\gamma $ $\theta _\gamma $(PA) $\Delta_\alpha('')$ $\Delta_\delta ('')$ $\chi_{\rm a}^2$/ $\rm d.o.f._a$ $\chi_{\rm e}^2$/ $\rm d.o.f._e$ d.o.f.$_{\rm a}$ d.o.f.$_{\rm e}$

SIS + $\gamma $		 LF 1.842 - - 0.145 -73.9 0.021 -0.052 190 42 3 -
  NLF 1.842 - - 0.144 -74.3 0.023 -0.068 183 44 1 674
SIE LF 1.823 0.45 -73.6 - - -0.015 -0.041 272 48 3 -
  NLF 1.826 0.48 -74.2 - - -0.059 -0.045 418 39 1 674
SIE + $\gamma $ LF 1.849 0.11 -49.9 0.130 -80.6 0.000 -0.034 177 38 1 -
  NLF 1.850 0.11 -50.1 0.130 -80.6 0.005 -0.044 10 39 1 672

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