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Fig. 1
The isothermal density profile (thick curve), and several of the transformed profiles κλ(θ), with λ ranging from 0.8 (flattest curve) to 1.2 (steepest curve), plotted as a function of x = θ/θE. Note that, if the SIS density profile provides a good fit to the lensing data, an equally good fit is obtained by all the κλ.
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