Left: G−R−z, three colour image of D49, as obtained by ground based imaging. There is a clear colour gradient with CO emission centered at the position of the red component. Right: V−i, high-resolution two colour image obtained by ACS/HST. The system is resolved into two components (a red and a blue), separated by ~1′′. The cross (and its size) in each panel depicts the centroid (and the position uncertainty) of the line emission detected by PdBI.