Lenstool models employing the 85 brightest member galaxies and two large-scale PIEMD dark matter halos and all multiple image systems of Table 1 detailed in Sect. 4.1.2 (left), or only one large-scale PIEMD dark matter halo and system 1 of Table 1 detailed in Sect. 4.1.3 (right). The critical curves for zs = 1.675 determined by the marching squares algorithm (see Appendix B) are marked in red, the caustics in yellow and the multiple images in blue.
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