Selection of the acceleration solutions. The left-hand panels correspond to solutions with constant acceleration, and those on the right to those with variable acceleration. Panels (a) and (b): significance vs. acceleration diagrams from a processing trial without the selection based on parallax error. The solutions with F₂ below the final threshold are in blue, while those above are in orange. The solutions of 5 < s < 12 were accepted in the absence of better solutions from another model, while the others were immediately accepted when s > 12 and F₂ was below 22 (for constant acceleration solutions) or 25 (for variable acceleration solutions). The number of solutions with a mean acceleration Γ > 3 au yr⁻² falls off when the significance exceeds 20. Panels (c) and (d): the F₂ vs. s diagrams of the solutions finally selected in the post-processing. The black dots are the remaining solutions with Γ > 3 au yr⁻²; they still correspond to the smallest significances, but this is essentially due to the filtering based on the parallax error.