Synthetic β maps generated for two separate models: a) and b) are generated for a point source and c) and d) are generated for a source with a Gaussian intensity profile with a FWHM of 19′′. Panels a and c have been generated by convolution of the source with a Uranus beam map, while panels b and d were convolved with the beam map after azimuthal averaging. The effective beam size is given in the lower-right of panel d, and the contours represent S/N levels of 3 and 25 from the 1.2 mm image.