Visualization of the visibility modeling of the [C II] line emission (white contours) in four systems that we showed in Figure 1. The left panel shows the dirty image of a single cube used for the visibility modeling (Section 3.2). The Gaussian FWHM fit from the dirty beam is shown as a white ellipse in the lower-left corner. The middle and right panel show the best-fit exponential disk model and the residual created by subtracting the model from the data, respectively. The contours start at 2σ and increase in steps of 3σ until 20σ. The residual maps do not show any peaks above the 2σ level around the rest-frame UV counterpart, which indicates that the observed emission is characterized by the best-fit model well. The rest of the sample is shown in Figure A.1 and A.2.