Performance of the flux estimation in the case of simulated data mimicking the blended sources in the Sunburst arc. The left panel shows the original simulated data and the right panel the residual after the two point source subtractions. The fainter source is placed south-west from the brighter source, and partially blended with it. The flux of the two sources are 30 and 5 in the same units as the native F606W image. These fluxes are recovered with typical errors ∼5% and ∼10% for the brighter and fainter source respectively.