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Fig. 4.


Time delay ratios of image pairs between the composite fiducial model and its SPT-transformed counterpart under a radial stretching with (f0, f2)=(−0.068, 0.012). Top panel: Δt̂/Δt normalized by the ratio are very close to 1, even in the quadruple image regime, which disagree with the results obtained in Schneider & Sluse (2014). Bottom panel: The impact of the SPT (cleaned from the pure MST with λ = 1 + f0 = 0.932) is around only a few tenths of percent. The error bars illustrates that the time delay ratios are not conserved in the quadruple image regime, as first suggested in Schneider & Sluse (2014).

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