Mean convergence of the model with power law DM component (bottom) or NFW DM component (top) with radial arc and without radial arc as constraints. We show the mean corresponding to the 1σ uncertainty for the DM component. We see directly that the radial arc helps to constrain the curve. The brown line indicates the Einstein radius rE and radial arc radius rrad_arc, respectively, and the black line represents the line . We plot for comparison green dashed lines for a concentration of cNFW = 5 and different M200 masses as indicated on the lines. A M200 mass of around 5 × 1014 M⊙ corresponds to an Einstein radius of 5″ which is the observed Einstein radius of the Cosmic Horseshoe.
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