Fits of 1-MBB and 3-TMPL models to maps containing 16 Gaussian sources with different radial temperature gradients. The upper frames show the true value τ₀ (frame a), the 1-MBB estimates (frame b), and the ratio of the 1-MBB estimates divided by the true values (frame c). Data in frames b-c have a resolution of 6.1 pixels. The lower frames show results of the 3-TMPL fit: the fit residuals (frame d), the estimated τ values (frame e), and the ratio of the 3-TMPL estimates and the true values (frame f). The nominal resolution in the lower maps is equal to 3 pixels.