Saturn T_b,rj for 70 GHz frequency channel (first frame from top), 44 GHz frequency channel (second and third frames), and 30 GHz frequency channel (fourth frame) as a function of D_P. Labels Tr1, Tr2, …, Tr8 denotes the transit from which each observation originates. Continuous curves refers to the best-fit models of T_b with various selections of data: all transits, transits 7 and 8 excluded, and transits 3, 7, and 8 excluded. The grey bands are 1σ uncertainties in the models.