Difference in predicted patterns between monochromatic and wideband models. The four detectors shown are 27S (30 GHz), 18S (70 GHz), 1a (100 GHz), and 1 (353 GHz). The bandpass shape is realistic and the source spectrum assumed here is CMB (but a similar result is obtained when the source spectrum assumed is that of Mars). In this and all subsequent beam contour plots, the axis units are in degrees.