Inferred delensed flux of Tr in the source plane, in internal HST units based on the measured flux at the t1–t5 positions. In these units, the observed flux at Tr is 40.16 e⁻ s⁻¹ in the HST F606W band. If we adopt as the delensed flux the maximum of the probabilities, this implies a magnification factor at Tr of ≈1700 for model M₁ and ≈4000–7000 for model M₂. Using the magnification in Pignataro et al. (2021) we infer a magnification of ≈600 at Tr.