Maximum likelihood orbits and joint PDF estimates for three representative cases. From top to bottom: BU220 (rather uncertain orbit), I292 (better defined orbit), YSC62 (well defined orbit). The size and color of the dots indicate the weight (uncertainty) of each observation; large clearer dots indicate larger errors (smaller dots are from more recent interferometric measurements, including, but not limited, to our own). The green line indicates the line of nodes, while the black line indicates the direction to the periastron. In the PDF-level curves (two columns on the right), the white dot indicates the MAP value given in Table 3.