(Top) Distribution of the brightness temperature along the midplane. The red and blue dotted lines show those of the subtracted Q band and the original Q band, respectively. The filled color regions represent ±1σ ranges. The temperature model of Tobin et al. (2013) and the modified model are indicated by the solid and dashed green lines, respectively. We also show the sliced beam sizes for the subtracted Q band data (θ_sub) and the original Q band data (θ_Q) at the top left. The yellow shaded regions indicate the radial positions for the CO₂ snow line (60–80 K). (Bottom) The red shaded region shows ﹩{\tau }_{7\mathrm{mm}}﹩ resulting from T_b of the subtracted data and the model temperatures.