Radial slope of DM profile, for the models with radial arc (bottom) and without radial arc (top) as constraints. We show the mean corresponding to the 1σ uncertainty. Lensing tightly constrains the slope at the Einstein radius as well as the improvement coming from the radial arc. The brown vertical lines indicate the Einstein radius rE and radial arc radius rrad_arc, respectively, and the black horizontal line represents the line .
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