Fig. 3.
Accuracy of the approximation of the time delay: ratio between τ≈, Eq. (12), and τ, Eq. (11), for the two images straddling the radial critical curve in NFW profiles with rs = 0.5 Mpc for κs = 0.15 (dotted curve), κs = 0.2 (solid curve), and κs = 0.3 (dashed curve) vs. the observed angular separation of the two images δθ = (r1 − r2)rs/Dl.
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