Integrated CO(5–4) line maps, optimized to show total emission in the SE and NW galaxies separately. Source centroids and sizes are listed in Table 1. Both maps have natural weighting with a beam of 1.6″ × 0.7″ (PA 15°; lower-left box in left panel). Left: CO(5–4) integrated over a 444 km s^-1-wide band, centered on the SE galaxy’s line center velocity. Contour steps are 0.24 mJy (1σ). The integrated CO(5–4) flux of the whole SE source, including the extension to the SW, is 1.6 Jy km s^-1. Right: CO(5–4) integrated over a 1067 km s^-1-wide band, centered on the NW galaxy’s line center velocity. Contour steps are 0.15 mJy (1σ). The integrated CO(5–4) flux of the whole NW source, including the extension to the northwest, over the 1067 km s^-1 band, is 2.6 Jy km s^-1 (see Table 2).