Velocity-integrated map of the CO(2−1) emission in A68-C0 overlaid on the HST image in band F110W. The extended blue contours are the contours integrated over the channels that define the blue-shifted component of the double-peaked CO emission line profile shown in Fig. 4, and the compact red contours are the contours integrated over the channels that define the red-shifted component of the CO profile. Contour levels start at ± 2σ and are in steps of 2σ. The critical line (yellow line) is located right in the middle of the two multiple images easily identified by the two bright bulges resolved in the HST image.