Observed HST/ACS F814W optical image of the multiple images B, C, D, E, and F of MACSJ0032-arc with the critical line in red (left panel); simulated observation of MACSJ0032-arc resulting from the best lens model when accounting for the PSF of the HST image (middle panel); and source plane reconstruction of MACSJ0032-arc obtained by simulating the morphology of the source as the combination of three elliptical Gaussian light profiles (right panel). The two bright knots, resolved in the HST rest-frame UV images, are separated by 1.14 ± 0.28 kpc in the source plane. The simulated HST observation includes a constant Gaussian noise background matched to the F814W noise level.
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