Classification of the galaxies based on a multiplicity of [C II] line (with contours) and rest-frame UV (background, HST/WFC3 F160W) emission. A 5″ × 5″ region is shown in each panel. The contours start at 2σ and increase in steps of 3σ until 20σ. The Gaussian FWHM fit from the synthesized dirty beam is shown as a white ellipse in the lower-left corner of each panel3. Two arrows shown in a panel of multiple-[C II] (CRISTAL-06a) correspond to two [C II] line components (denoted as ‘W’ and ‘E’) that are visually identified.