Dust continuum images at different frequencies and their radial profile comparison. Left and right panels: [C II] and CO (9–8) underlying dust continuum maps at 262 and 147 GHz, respectively. The black plus sign is the quasar position from HST snapshot observations. The bottom-left ellipse in each panel shows the restoring beam with FWHM sizes of × and × , respectively. The black contours are [−3, 3, 9, 27, 81] × rms_con for both maps. The rms_con at 262 and 147 GHz are 0.02 and 0.01 mJy beam⁻¹, respectively. The overplotted white contours are from [C II] and CO (9–8) emission lines, and the contour levels are the same as those of the black contours in the left panels of Figs. 1 and 2. Right panel: comparison of the surface brightness of the continuum at two different frequencies. The blue and red symbols with error bars are for the scaled 262 and 147 GHz dust continuum, respectively. The error bar represents the deviation of the values of all pixels in each ring used to do the aperture photometry.