Post-processing filtering of the VIMF solutions. Panel (a): F₂ vs. D diagram of the 2508 solutions obtained from the main processing. The proportion of large D, and therefore false solutions, increases gradually beyond F₂ = 25, to the right of the vertical red line. Panel (b): significance vs. D diagram of the 1660 solutions with F₂ < 25; acceptable solutions cluster on a sequence of D increasing with significance; abnormally large D solutions are rejected by restricting to significances greater than 20 (to the right of the vertical red line), leaving a final selection of 869 solutions.