Left panel: absolute magnification map of PSZ1-G311. We assume a source redshift of z_s = 2.3702, coinciding with the redshift of the Sunburst arc. The magnification values start at μ = 0 and saturate at μ = 100. The critical lines for the same source redshift are shown in red. Right panel: map of the magnification uncertainties. We show the relative statistical error on the absolute magnification (Δμ/μ).