Top panel: Dust extinction map of the SN H0pe host galaxy, reconstructed in the source plane based on our extended-image lens model. The green star marks the SN position relative to its host; thin black contours show its (logarithmically spaced) isophotes. We note the consistency between the perturbed isophotes and the dust extinction map. The bottommost high-extinction feature (about three bottom rows of the source-plane grid) arises mainly from low data S/N and image-plane flux contamination at the edge of the arc mask. North is at the top and east is to the left. Bottom panel: Uncertainty in A_V due to the posterior uncertainty of our strong lensing model. In both panels, the pixel scale is $0\stackrel{″}{.}048$.