Fig. A.1.

Posterior distribution of the parameters of the foreground lens object, as obtained by the lens modeling and MCMC runs (see Sect. 5 for details). The constraints are given on the following parameters: the position (ΔRA and ΔDec in arcsec), the Einstein radius (b), the ellipticity (e), and the position angle (θe) with the orientation measured east of north. The contours show the 0.5, 1, 1.5, and 2σ of the integrated likelihood. The mean and the ±1σ interval around the mean are displayed as histograms along the diagonal of the plot.
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