Fig. 3.
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GRASP model of Planck at 353 GHz (left panel) and 857 GHz (right panel), with circles showing the theoretical location of the main grating lobes. The model is the RFFM for individual detectors 353-1 and 857-1, to which has been added regular dimpling with 10 μm amplitude. Note that the RFFM model at 857 GHz uses a single-moded Gaussian feed, in contrast to the real multi-moded feed. The lobes are labelled according to M/S for (Main/Secondary) and the corresponding grating size scale. The axes are in degrees and the contours are labelled in dB from peak. The peak of the main beam is suppressed for clarity.
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