Overlay of the CO (2−1) integrated intensity emission (left, Olsson et al. 2010) and of the CO (2−1) and low-resolution CO (1−0) (middle, Olsson et al. 2010) integrated intensity emission on the HST F435W/F814W filter color-map image, and overlay of the CO (1−0) emission (right) on an HST F435W filter image on the scale of the whole merger system. Note how well the CO (2−1) emission distribution correlates with the dust lanes (light gray colors on the left-hand side and the middle in this figure) and that the position of the emission peak of the CO (1−0) distribution coincides with the main part of the dust emission in this region. The CO beam sizes (CO (2−1): 0.50′′ × 0.44′′, CO (1−0): 4.44′′ × 4.10′′) are shown in the lower left corners.