Left row: high angular resolution images of DM Tau. On top, high resolution 1.3 mm image, in the middle, the 2.7 mm (or 3.4 mm for some sources) image with a box indicating the size of the 1.3 mm view. For sources (like this one) that have independent data sets at other wavelengths (1.4 or 3.4 mm), a lower panel displays the corresponding image for the same area as above. All contours are 10% of the peak value to illustrate consistently the apparent sizes and low level extensions. Contour level is 2 mJy/beam (3.5σ) at 1.3 mm, 0.78 mJy/beam (2σ) at 2.7 mm, and 6 mJy/beam (7σ) at 1.4 mm. Middle row: deprojected and circularly averaged visibilities and best-fit models for each wavelength. Red is for power law, green for exponential edge. Right panel: best-fit opacity profile (perpendicular to the disk plane, i.e. κ_νΣ(r)) for the 1.3 mm and long wavelength models. The continuous line is for the short wavelength, the dashed line for the long wavelength. The vertical lines indicate the effective angular resolution.