Maps of residuals for the best fit models of the disk to the PACS images at 70, 100, and 160 μm from left to right. The post-fit residuals are between ± 3.5σ₀, coded as black, blue, orange, yellow and white over this range (σ₀ is the same noise rms as used for contours in Fig. 1 but the color scale is not the same as in Fig. 1). In zooming the electronic version, the contours apparent in these maps are −3, −2, −1, 1, 2, 3 σ₀ (dashed contours are negative levels). The two background sources are masked in the 100 and 160 μm images as the dotted squares show.