Sum of the F150W and F200W NIRCam observations, smoothed by a two-pixel Gaussian kernel to better visualize the inhomogeneities along the arc. The clusters discussed in Adamo et al. (2024) and Section 5.1 of the current work are marked by green ellipses. The red arrows point to the position of the regions (detected at the 3 − 4σ level) discussed in the text. The same regions are also indicated in the inset panel, showing a smoothed version of the sum of the LW NIRCam filters available (F277W, F356W, F410M, and F444W).