Intensity profiles in a cut along the major axis direction for the three CBDs in our sample observed at 1.3 and 3mm. The zero-offset corresponds to the mid-point between the circumstellar disks. Positive offsets track positive R.A. offsets. The red dotted line is the predicted temperature profile due to irradiation and the bottom panels show the resultant optical depth at each wavelength based on this temperature profile. The emission from the circumstellar disks or temperature substructures in the case of IRAS 162923A are masked out from the central region.