HST F098M image (epoch 2010-10-29) showing the probabilities for the positions of the candidates in 1680. The center of expansion (including the uncertainty of 1″) is depicted as a black circle. The search radius of 600 km s⁻¹ around the center of expansion is shown in orange. The contours show 68%, 95%, and 99.7% confidence intervals (using the same colors as in Fig. 1). A red arrow marks the movement since 1680 to their current position.