Example of a map in the (u, v) reference frame for Jupiter. This image shows the first transit as seen by radiometer 27–0 (30 GHz). Top left: map of T_ant in K_cmb ranging from − 4 × 10⁻⁴ K_cmb to 0.4 K_cmb. Top right: map of the background model, expressed as T_ant in K_cmb ranging from − 4 × 10⁻⁴ K_cmb to 1 × 10⁻³ K_cmb. Bottom left: histogram of T_ant in K_cmb for the background. The green points indicate the samples in the histogram, the red line indicates the best-fit Gaussian distribution,and the threshold for the classification mask is shown by the dashed blue line. Bottom right: classification mask. The grey region shows the planet ROI, the white annulus is the background ROI, and the blue regions denote unused samples.