Top: expected flux distribution along the Binospec slit based on the HST F606W+F814W image (Figure 1(a)). The solid black line shows the HST profile, the dotted blue lines show the five Gaussian model components, and the solid red line shows their sum. The strongest component is galaxy A, with galaxy B to its left (southwest). The two outer peaks are the Einstein ring of the SMG, and the fifth component is a broad Gaussian corresponding to the extended emission. Bottom: comparison of the blurred HST spatial model (from above, red) to the observed MMT Binospec spatial profile summed over all wavelengths (black).