Exploring the sensitivity of our algorithm to source separation, relative strengths, and background level. The median posterior probability of ﹩K=2﹩ across the 100 simulations is shown; ﹩{K}_{{\rm{true}}}=2﹩ in all cases. The results from the spatial-only model (left column) and the full model (right column) are both shown. Red indicates probabilities less than 0.1, and white indicates probabilities greater than 0.5. (Intermediate colors indicate probabilities between 0.1 and 0.5.)