Comparison of 250 µm fit residuals for models with hypothetical embedded sources. Each row corresponds to a combination of FWHM and A_V values, as noted on the left side of the frames. Each column of frames corresponds to a different case concerning the point sources: Col. 1 is without sources, Cols. 2–3 with sources embedded at the location of the LOS density maximum, and Cols. 3–4 with sources displaced 0.2 pc along the LOS from to the density maximum. The temperatures of the point sources are given above each column of frames.