Best-fit model of the lensed source positions of the Cosmic Horseshoe, which are identified using our best-fit mass model with source SB reconstruction. This model assumes a power law profile for the DM distribution. It is obtained using, as constraints, eight multiple image systems for the Einstein ring (circles) and the radial arc and its counterimage (squares). We delineate the predicted image positions with a cross. We can see that all predicted images are very close to the selected images. The blue lines correspond to the critical curves (solid) and caustics (dashed) computed for the redshift of the radial arc, i.e., zs, r = 1.961, and the red line to the critical curves (solid) and caustics (dashed) computed for the redshift of the tangential arc, i.e., zs, t = 2.381. The lens position is denoted with a blue star. The small additional red features near the radial arc source position, shown in the lower left corner in detail and on the right-hand side, are probably due to the presence of radial arc source, i.e., as a result of multiplane lensing. Indeed, these features do not appear in the single-plane case (blue line). The filled squares and circles correspond to the weighted mean positions of the predicted source position, which are shown in more detail in the zoom in the upper and lower left corner. The figure is oriented such that north is up and east is left.
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