Independent result confirming the likely counterimage. From left to right, the first and second panels show the (negative) original images of the arc in F090W and F200W; the third panel shows the convolved image from F090W to F200W using WebbPSF models; the fourth image shows F200W − 1.87 × F090W to subtract off the local background in the neighbor of LS1. In all panels, red and blue circles show the LS1 and LS1′ positions, respectively.